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ultraviolette lampen zur wasserdesinfektion - ultraviolet light stock-fotos und bilderULTRAviolette Lampen zur Wasserdesinfektion
UV-Lampen in einer Wasserdesinfektionsanlage
gerät zum waschen eines zahnärztlichen 3d-drucks - ultraviolet light stock-fotos und bilderGerät zum Waschen eines zahnärztlichen 3D-Drucks
Gerät zum Waschen eines dentalen 3D-Drucks in einer Reinigungslösung und zum Aushärten der Form mit UV-Licht.
Neon-Licht Blacklight Disco Party-Nacht
transparente uv-lampe einsatz für wasser reinigen - ultraviolet light stock-fotos und bilderTransparente UV-Lampe Einsatz für Wasser reinigen
selbstpflege und spa - ultraviolet light stock-fotos und bilderSelbstpflege und Spa
uv-c g23 glühbirne ultraviolett zerstören viren - ultraviolet light stock-fotos und bilderUV-C G23 Glühbirne Ultraviolett zerstören Viren
UVC G23 Leuchtstofflampe. Ultraviolett in der Lage, Keime und alle Arten von Bakterien mit UV-Licht zu eliminieren. Viren auf Werkzeugen und Oberflächen zerstören
uv-index-chart mit cartoon-sonne - ultraviolet light stock-grafiken, -clipart, -cartoons und -symboleUV-Index-Chart mit Cartoon-Sonne
hygiene-check mit uv-licht - ultraviolet light stock-fotos und bilderHygiene-check mit UV-Licht
Überprüfung mit ultraviolettem Licht nach Desinfektion der Hände zeigt Hygienemängel (dunkle Bereiche)
neon-leuchtstäbe auf transparentem hintergrund.
blau, weiß, gelb, orange, grün, rosa, rote led-linien leuchtende vektorillustration. elektrisches farbpaketdesign für partys oder clubs - ultraviolet light stock-grafiken, -clipart, -cartoons und -symboleNeon-Leuchtstäbe auf transparentem Hintergrund. Blau, weiß, gelb,
Neonleuchtstäbe auf transparentem Hintergrund. Blaue, weiße, gelbe, orange, grüne, rosafarbene, rote LED-Linien leuchten Vektorillustration. Elektrisches Farbpaketdesign für Party oder Clubs.
teenager-mädchen unter schwarzlicht - ultraviolet light stock-fotos und bilderTeenager-Mädchen unter Schwarzlicht
urlaub strand reisen-set-set - ultraviolet light stock-grafiken, -clipart, -cartoons und -symboleUrlaub Strand Reisen-Set-Set
Strand Urlaub Reise Kit Set Wohnung Kindish Cartoon Stil Helle Farbe Vektor Illustration auf weißem Hintergrund
uv-lampen - ultraviolet light stock-fotos und bilderUV-Lampen
eine reihe von maniküre-werkzeugen: schere für einen haarschnitt und einen nagelhautschieber und eine uv-lampe zum trocknen von schellack auf nägeln - ultraviolet light stock-fotos und bilderEine Reihe von Maniküre-Werkzeugen: Schere für einen Haarschnitt.
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Lila Neon-Design. Lila blau abstrakt leuchtend. Leuchtende...
Das lila Neon-Design. Lilablau abstrakt leuchtend. Leuchtende Neonlampenlinien. 3D-Illustration.
schutzmaske - ultraviolet light stock-fotos und bilderSchutzmaske
weibliche hand in trocknender uv-lichtmaschine im nagelstudio - ultraviolet light stock-fotos und bilderWeibliche Hand in trocknender UV-Lichtmaschine im Nagelstudio
professionelle werkzeuge für maniküre und pediküre nägel - ultraviolet light stock-fotos und bilderProfessionelle Werkzeuge für Maniküre und Pediküre Nägel
Professionelle Werkzeuge für Maniküre und Pediküre Nägel, im Schönheitssalon
vektordiagramm mit dem sichtbaren lichtspektrum. sichtbares licht, infrarot und ultraviolett. sichtbares elektromagnetisches spektrum auf weiß isoliert.
- ultraviolet light stock-grafiken, -clipart, -cartoons und -symboleVektordiagramm mit dem sichtbaren Lichtspektrum. Sichtbares Licht,
kinderhand unter dem uv-licht, die die einzigen teile zeigt, die richtig desinfiziert wurden - ultraviolet light stock-fotos und bilderKinderhand unter dem UV-Licht, die die einzigen Teile zeigt, die...
uv-lampe zur desinfektion und desinfektion. uv-lampe zur luftdesinfektion. uv-desinfektion. konzept der sauberkeit und hygiene, das blaue licht der lampe tötet bakterien und viren ab - ultraviolet light stock-fotos und bilderUV-Lampe zur Desinfektion und Desinfektion. UV-Lampe zur...
hand und sonne der frau - ultraviolet light stock-fotos und bilderHand und Sonne der Frau
Die Hand der Frau und die Sonne.
schöne asiatische frau mit sonnenhut lächelt und hebt die hand, um das sonnenlicht zu blockieren - ultraviolet light stock-fotos und bilderSchöne asiatische Frau mit Sonnenhut lächelt und hebt die Hand,.
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Schöne kurzhaarige asiatische Frau mit weißem Oberteil, Strohhut schaut nach oben, lächelt und hebt die Hand, um das Sonnenlicht zu blockieren
sonne in einem blauen himmel - ultraviolet light stock-fotos und bilderSonne in einem blauen Himmel
Helle Sonne mit schönen Strahlen in einem blauen Himmel mit hellen Wolken. Platz zum Kopieren.
tulpenblüte in neon hellblau und pink - ultraviolet light stock-fotos und bilderTulpenblüte in neon hellblau und pink
Doppelt rosa gefärbte Tulpenblüte in blauem Neonlicht auf dunkelviolettem Hintergrund. Vorderansicht, Leerzeichen kopieren
futuristische frau trägt brille mit neonlicht. - ultraviolet light stock-fotos und bilderFuturistische Frau trägt Brille mit Neonlicht.
poster zum uv safety awareness month, juli. vektor - ultraviolet light stock-grafiken, -clipart, -cartoons und -symbolePoster zum UV Safety Awareness Month, Juli.
Vektor
Poster zum UV Safety Awareness Month, Juli. Vektordarstellung. EPS10
menschliche haut mit und ohne sonnenschutz auf weißem hintergrund. - ultraviolet light stock-grafiken, -clipart, -cartoons und -symboleMenschliche Haut mit und ohne Sonnenschutz auf weißem Hintergrund.
Menschliche Haut mit und ohne Sonnenschutz auf weißem Hintergrund. Beschädigte menschliche Haut vor und nach Sonnenschutz. Körperfettschichten Epidermis. Flache Cartoon-Vektorillustration
cannabis mit violetten blättern isoliert auf schwarzem hintergrund. blühendes marihuana mit lebendigem laub und knospenblüte - ultraviolet light stock-fotos und bilderCannabis mit violetten Blättern isoliert auf schwarzem...
sonnenfackeln am blauen himmel und wolken im winter - ultraviolet light stock-fotos und bilderSonnenfackeln am blauen Himmel und Wolken im Winter
für Sonne Winterwetter blauer Himmel Schnee sonnige Luft weiß Oberflächenkonzepte
eine frau mit fluoreszierendem make-up bemalt - ultraviolet light stock-fotos und bilderEine Frau mit fluoreszierendem Make-up bemalt
Eine junge Frau malte mit fluoreszierenden Farben, die vor ultraviolettem Licht standen.
Der Raum ist dunkel mit blauem Hintergrund.
Infografik zu UV-Strahlen und sichtbarem Licht im...
Infografik zu UV-Strahlen und sichtbarem Licht im Gesundheitswesen. Vektor flache Illustration. UVA-, UVB-, UVC-Lichter gehen und reflektieren durch Ozonschicht und Sonnenschutzlinse zum Augapfel. Design für UV-Bewusstseinsmonat.
led-lampen für vertikalen garten im herbst und winter. phytolampen hängen vom glasdach im gewächshaus - ultraviolet light stock-fotos und bilderLED-Lampen für vertikalen Garten im Herbst und Winter....
LED-Lampen für den Anbau von vertikalen Gärten während der Herbst- und Wintersaison und Glück des Blitzes.
Phytolampen hängen vom Glasdach im Gewächshaus oder in der Orangerie mit exotischen Pflanzen. Garten- und Zimmerpflanzenpflege
Lineo Editable Stroke - Wetter- und Meteorologie-Liniensymbole
yellow umbrella mit helle sonne und blauer himmel - ultraviolet light stock-fotos und bilderYellow Umbrella mit helle Sonne und blauer Himmel
weibliche hand in der lampe für maniküre - ultraviolet light stock-fotos und bilderWeibliche Hand in der Lampe für Maniküre
Nagellampentrockner für Gelnagellackhärtung Maniküre Pediküre
stilvolle afro-mädchen-porträt in der nähe von rosa blau neon licht zeichen. porträt in kühlem neonlicht. - ultraviolet light stock-fotos und bilderstilvolle Afro-Mädchen-Porträt in der Nähe von rosa blau Neon...
uv-beschichtung großformatdrucker - ultraviolet light stock-fotos und bilderUV-Beschichtung Großformatdrucker
ultraviolettes licht auf einer hand zeigt bakterienwachstum - ultraviolet light stock-fotos und bilderUltraviolettes Licht auf einer Hand zeigt Bakterienwachstum
UV-ultraviolettes Licht an einer Hand, das die Wirkung von Bakterien und Viren auf eine nicht gewaschene Oberfläche veranschaulicht, was die Bedeutung von guter Hygiene und Händewaschen besonders während einer Pandemie wie Covid-19 zeigt.
Marble Colorful Neon Wave Pattern Prism Glitch Effekt Abstract...
hautpflege linie symbole. sonnenschutzmittel, uv-verteidigung vektor dünne linie icons. sonnenschutzmittel, suntan regeln lineare illustrationen. sommer, urlaub am meer kosmetik. - ultraviolet light stock-grafiken, -clipart, -cartoons und -symboleHautpflege Linie Symbole. Sonnenschutzmittel, UV-Verteidigung...
3d rendering, rosafarbene neonlinien, abstrakter hintergrund, leerer raum, geometrische formen, virtueller raum, ultraviolettes licht, 80 jahre stil, retro-disco-club, moal-lasershow - ultraviolet light stock-fotos und bilder3d Rendering, rosafarbene Neonlinien, abstrakter Hintergrund,...
uvc-lampe zur sterilisation - covid-19 präventionskonzept - ultraviolet light stock-fotos und bilderUVC-Lampe zur Sterilisation - COVID-19 Präventionskonzept
neonblaue lila lichter posieren im studio asiatische chinesische weibliche mode model mit polka dot bluse im studio porträt - ultraviolet light stock-fotos und bilderNeonblaue lila Lichter posieren im Studio asiatische chinesische.
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Blick auf die Oberseiten, den blauen Himmel und verschwommene Bäum
Blick auf Toptrees der blaue Himmel und verschwommene Bäume
vektordiagramm mit dem ultravioletten lichtspektrum uv isoliert auf weißem hintergrund. elektromagnetische strahlung mit einer wellenlänge von 10 nm bis 400 nm. - ultraviolet light stock-grafiken, -clipart, -cartoons und -symboleVektordiagramm mit dem ultravioletten Lichtspektrum UV isoliert...
Vektordiagramm mit dem ultravioletten Lichtspektrum UV mit dem sichtbaren Spektrum und Infrarot isoliert auf weißem Hintergrund. Elektromagnetische Strahlung mit einer Wellenlänge von 10 nm bis 400 nm. Blaues oder violettes Licht. UV-A, UV-B, UV-C, Vakuum UV.
porträt des gesichts eines mannes unter uv-licht - ultraviolet light stock-fotos und bilderPorträt des Gesichts eines Mannes unter UV-Licht
Männliches Porträt mit fluoreszierenden Farben unter UV-Licht gemalt
uv-strahlung-symbol im flachen stil.
ultraviolette vektor-illustration auf weißem isoliertem hintergrund. solarschutz-geschäftskonzept. - ultraviolet light stock-grafiken, -clipart, -cartoons und -symboleUV-Strahlung-Symbol im flachen Stil. Ultraviolette Vektor-Illustra
uva- und uvb-strahlen dringen in den hautschichtvektor ein. - ultraviolet light stock-grafiken, -clipart, -cartoons und -symboleUVA- und UVB-Strahlen dringen in den Hautschichtvektor ein.
UVA- und UVB-Strahlung dringt in den Hautschichtvektor auf weißem Hintergrund ein. UVA- und UVB-Strahlen beeinflussen die Haut auf unterschiedliche Weise.
vektor-icons set von äußeren einflüssen und schutz vor es. antibakteriell, wasser, hitze, kälte, staub, auswirkungen und kratzer widerstand, uv-strahlen, stoßfest, winddicht, antistatisch und etc.. - ultraviolet light stock-grafiken, -clipart, -cartoons und -symboleVektor-Icons Set von äußeren Einflüssen und Schutz vor es....
uv-strahlen-symbol gesetzt. uv-schutz, strahlung und schildzeichen.
sonnengefahr und sonnencremelösung. - ultraviolet light stock-grafiken, -clipart, -cartoons und -symboleUV-Strahlen-Symbol gesetzt. UV-Schutz, Strahlung und...
Gelbe Sonnensymbole. Designelement für Hautpflegeprodukte. Vektorillustration, flach, ClipArt.
frau porträt in neon - ultraviolet light stock-fotos und bilderFrau Porträt in Neon
sonnenspektrum des lichts. flache vektorillustration. ultraviolette bis infrarote farbe. sonnensymbol auf weißem hintergrund. - ultraviolet light stock-grafiken, -clipart, -cartoons und -symboleSonnenspektrum des Lichts. Flache Vektorillustration....
Sonnenspektrum des Lichts. Vektor flache Illustration. Ultraviolette bis Infrarotfarbe. Sonnensymbol auf weißem Hintergrund.
stereolithographie-3d-drucker - ultraviolet light stock-fotos und bilderStereolithographie-3d-Drucker
Ein Stereolithographie-3D-Drucker im Labor druckt eine Struktur aus einem Photopolymer.
Erstellen eines skalierten Modells durch UV-Polymerisation.
Medizinische Maske Covid-19 unter ultraviolettem Licht
Medizinische Schutzmaske mit der Aufschrift Covid-19 und mit kleinen Coronavirus-Molekülen unter einer UV-Lampe
sonne in den blauen himmel mit lensflare - ultraviolet light stock-fotos und bilderSonne in den blauen Himmel mit lensflare
uv-schutz auf weiß gelb - ultraviolet light stock-grafiken, -clipart, -cartoons und -symboleUV-Schutz auf weiß gelb
gelber UV-Schutz auf weiß. ungewöhnlicher Flat-Style-Trend Modernes Markengrafikdesign. Konzept des einfachen Abzeichens für Körperpflege oder Behandlung oder Dekorationssymbol für kosmetisches Öl oder Creme
desinfektionsliniensymbole. vektor-illustration enthalten symbol als spray-flasche, bodenreinigung mop, waschen hand gel, autoklav uv lampe umriss piktogramm für housekeeping 64 x 64 pixel perfekt editierbarstrich - ultraviolet light stock-grafiken, -clipart, -cartoons und -symboleDesinfektionsliniensymbole.
Vektor-Illustration enthalten Symbol...
Stoffmerkmale. Dekoratives Textil. Baumwolle, Wolle, Bambus,...
Stoffeigenschaften. Dekoratives Textil. Baumwolle, Wolle, Bambus, Leder und Farbe. Öko-Materialien. Wasser- und schneefest. Pixel Perfect Vector Thin Line Symbole. Einfaches minimales Piktogramm
3d abstraktehintergrund mit ultravioletten neonlichtern, leerem rahmen, glühender tunneltür mit palme - ultraviolet light stock-fotos und bilder3D abstraktehintergrund mit ultravioletten Neonlichtern, leerem...
strandliegen und sonnenschirme vorne am sonnenuntergang - ultraviolet light stock-fotos und bilderStrandliegen und Sonnenschirme vorne am Sonnenuntergang
Sonnenschirm und Sonne vor Sonnenuntergang am Sandstrand der Stadt am Meer Ozean Konzept des Tourismus Reisen und Körperhautschutz vor Melanom Hautkrebs Sonnenbrand.
How to Do Ultraviolet Photography
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Ultraviolet photography is an interesting photographic method of capturing images by using light from the ultraviolet spectrum. Photographs captured in this way can have an artistic purpose but they can also be used in dermatology or forensics because ultraviolet images reveal deterioration and damages of various structures (such as skin) not apparent under visible light. These images can also reveal hidden patterns in flowers that only insects can see, which can look stunning in macro photography.
To learn about the basics of ultraviolet photography, read on!
Photo by Beo BeyondHow Does UV Photography Work
As we all know, humans can’t see UV light. We can see only so-called ’’visible light’’ – its wavelength ranges between 400 and 750 nanometers. Because of that, we need UV photography to visualize any wavelength lower than 400 nm. The band of UV radiation goes from 1 to 400 nm, but UV photography captures only the near-UV region, which is between 200 and 380 nanometers in wavelength.
There are two ways to use UV light in photography – reflected UV and UV induced fluorescence.
In the case of reflected UV, a camera captures rays reflected by a certain object. When it comes to UV induced fluorescence, an object absorbs UV radiation energy and emits fluorescent light you can capture with a camera.
Photo by Kelsey DodyReflected UV photography
In order to make reflected UV photography possible, your subject has to be illuminated directly by UV emitting lamps or sunlight. You also have to place a UV pass filter on the lens, because this filter allows ultraviolet light to pass while it blocks all visible and infrared light. It’s also very important that your UV pass filter doesn’t have any infrared leak. These leaks can easily obscure the details in images that would have been preserved if the filter was blocking infrared wavelengths completely.
Most types of lenses allow longwave UV wavelengths to pass but absorb all the other UV wavelengths (350 nm and below).
Because of this issue, it’s best to use specially developed lenses for UV photography – these lenses have elements made from fused quartz or quartz and fluorite. A good example of a dedicated UV lens is Nikon UV-105.
There are also popular UV-capable lenses:
- Nikon 35mm F/2.5 Series E
- Optomax 35mm F/3.5
- Nikon AF 50mm F/1.8D
- Yongnuo 50mm F/1.8
- Nikon EL 105mm F/5.6
When it comes to digital cameras capable of reflected UV photography, you can use for instance unmodified Nikon D70 or D40, but there are many other cameras that can be a great choice if you remove their internal UV and IR blocking filter.
There is also Fujifilm FinePix IS Pro digital camera, designed specifically for ultraviolet and infrared photography.
Photo by PlatelickerUV Induced Fluorescence Photography
Photography based on fluorescence uses the same ultraviolet radiation as reflected UV photography. However, in this case, the filter used on the lens should absorb or block all ultraviolet and infrared light and permit only visible light to pass.
UV induced fluorescence photography should be performed in a dark room, with a black background. The photographer should wear dark clothes for better results since various fabrics can glow under UV. Bear in mind that any camera or lens can be used for this type of UV photography because only visible wavelengths are being captured.
Many natural objects and substances fluoresce under ultraviolet light, such as rocks and minerals, fungi and bacterial cultures, lichens, plants, and even body tissues and fluids.
Photo by Victoria BorodinovaWhite Balance And False Colors In UV Photography
Since UV images record radiation which is not in the visible range, you actually can't choose the correct white balance for them. This gives you space for experimentation and creativity – you can go wild in post-processing!
It’s also useful to know that cameras, lenses and UV-pass filters which record a wide UV spectrum tend to provide a range of false colours unrelated to the actual colours of the subject.
Images of flowers often provide these false UV colours and they can be very appealing from the artistic point of view. However, if your lens only transmits the longest UV wavelengths your photos will feature a monochromatic violet colour regardless of the subject.
UV Filters
Modern filters for UV photography can be categorized into three types.
Sandwich-type filters are made by joining together different types of ionic glass to allow the transmission of ultraviolet radiation and at the same time block the transmission of infrared radiation. These filters usually display a lower contrast and image resolution compared with other filter types.
Combination dielectric and ionic filters are the most useful filter types for UV photography and they have a single layer of ionic glass and different types of coatings on either side.
There are also interference filters – they use dielectric coatings on a substrate of fused silica that transmits UV.
When it comes to the best known UV-pass filters, check out the ones below:
- Schuler UV
- Baader U
- Astrodon Uvenus
- Asahi Spectra XRR0340
UV Photography In Forensics And Dermatology
The history of ultraviolet photography and its applications are pretty interesting.
This type of photography was used as evidence in court as early as 1934. Photos made with ultraviolet radiation can show bruises or scars not visible on the surface of the skin because they have been already healed. Because of this, such photographs can be the perfect evidence of physical assault even after visible healing of wounds have been completed.
UV photographs don’t show only bruises and scars – they can show sun damage too in the form of mottled pigmentation. Dark spots on UV photographs indicate sun damage, with darker and larger spots indicating greater damage. This is extremely useful in dermatology.
In addition to this, ultraviolet photography can be used to detect counterfeit documents.
To learn more about ultraviolet photography (as well as infrared and X-ray photography) check out the links below.
Further Reading:
- 4 Crazy Photography Techniques That You Probably Didn’t Know About
- Getting Started With UV Photography
- Ultraviolet Photography And Insect Vision
- How To Shoot Infrared Photography
- X-Ray Photography: An Unusual Type Of Close-Up Work
- What If We Could See All Wavelengths Of Light?
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Ultraviolet photography is a genre that is relatively little used by photographers, despite the fact that the pictures are exciting and extraordinary. Why is this happening? We dare to suggest that just photographers who are unfamiliar with the intricacies of the process are afraid of the complexities and the need for additional investments in equipment for ultraviolet photography in advance. Much of UV photography revolves around a world that we usually don't notice because of its mundane nature. An attempt to look at simple objects through an "invisible prism" helps to get beautiful images - new and unusually entertaining in their outlandishness. Using UV light, which is outside the human-perceptible spectrum, is a great way to start exploring and enter the world of UV photography. There are two types of UV photography - UV reflection and UV fluorescence. UV reflection photography uses a source that contains ultraviolet light (such as the sun or a full spectrum light source). In this case, ultraviolet is collected and hits the camera sensor. To make this possible, a modification of the camera is required, similar to what is done for infrared photography, only at the other end of the spectrum. UV reflection photography can reveal hidden patterns on flowers that only insects can see. For example, in the form of spectacular "landing strips" of pollen to attract pollinators.
See the difference between conventional and UV reflection photos. The bottom is visible light and the top is an infrared image of the same gerbera flower. Although the usual monochrome image is certainly interesting, but the fluorescence of the flower (close-up) turned the picture into a magical one to perceive. nine0006
UV fluorescence does not require camera modification. You just need to pay close attention to ensure that only the UV beam hits the object. If something in the frame is fluorescing, the visible light will "bounce" back towards the camera. An interesting observation: almost everything in nature fluoresces to one degree or another. You may have heard of insects that glow under ultraviolet light. But if you provide enough light only for the UV beam, then everything can "light up".
This is what a UV setup looks like. Each of these Yongnuo 685 flash units was modified to output exclusively ultraviolet light, a process that only took about five minutes. How to modify the flash for UV shooting You need to disassemble the flash. CAUTION! Flash is high voltage equipment that you open at your own risk. You could cause serious injury or injury to yourself if the flash is not discharged and you touch parts that must not be touched. If you do not have experience in handling such electrical equipment, entrust it to a professional. nine0039 Remove the two pieces of plastic that are in front of the xenon flash. They control the beam of light but also block UV radiation. There are two screws and some clips under the rubber inserts on the sides of the flash. For example, two Hoya U340 and MidOpt BP365 filters each give very little visible light leakage; one is red, the other is purple. Together they overlap and block the visible spectrum. nine0006 Some flowers or insects are completely uninteresting as subjects because they don't fluoresce too much compared to others. It is important to note that no one will ever be able to see the world the way it appears in ultraviolet photographs - this requires that all visible light be filtered, which cannot be in nature.
Insects can reflect UV radiation. For example, like this cicada. But when you photograph the same cicada in a dark room and cut off all visible light, the transparent wings glow a fantastic blue. nine0006 .
The same will happen with some types of dragonflies, although most insects with smaller wings are unlikely to turn out so fabulous in photographs. Tags: ideas, macro |
But in vain! Canadian macro photographer ©Don Komarechka not only studies UV photography for himself, but also enthusiastically shares his knowledge with all who are interested. nine0006 
nine0006 
In this method, the key factor is the intensity of the light flux. And it must be clean," as even a partial hit in the visible spectrum lens will contaminate the results. 
After you remove them, and the flash is reassembled, you will need to filter the light to UV radiation. Use a combination of two 77mm filters for amazing results. 
The key to UV photography is constant experimentation. And this should be remembered! Capturing the invisible world: UV photography | Articles | Photo, video, optics
Ultraviolet photography is a photography technique that uses either reflected ultraviolet light or visible fluorescence. UV photography is actively used in medical diagnostics, restoration of art objects, forensics, and sometimes as a creative way of self-expression.
DEFINITION
In my previous article, I explained that a person perceives only a small part of the spectrum of electromagnetic waves (we call it light). Thus, the wavelengths of ultraviolet radiation are in the range from 10 nm to 400 nm. For UV photography, only near radiation is of interest: air is opaque for wavelengths shorter than 200 nm, lenses are opaque for wavelengths shorter than 180 nm.
nine0006
The near range is often referred to as "black light" because it is invisible to the human eye but close to visible light. For the far and extreme ranges, the term "vacuum" is used ( VUV ): waves of this length are almost completely absorbed by the Earth's atmosphere.
"Forbidden Treasure", Don Komarechka. Source: donkom.ca
INSTRUMENTS
Filters
Filters are transparent to some wavelengths but opaque to others. According to this principle, two types of UV filters can be distinguished:
- Blocking
All standard digital cameras have them. Therefore, any camera is suitable for imaging using induced fluorescence.
- Transmissive
When photographing in reflected light, use filters that transmit only ultraviolet radiation. For example, Baader-U, StraightEdgeU, Kodak Wratten 18A, B+W 403, Hoya U-340 and Kenko U-360. Filters are made of special colored glasses.
Radiation sources
The natural source of ultraviolet radiation is the sun. The ratio of waves of different ranges depends on the height of the Sun above the horizon and the camera above the water level, on cloudiness, soil, horizontal surface material, the presence of a reservoir and air humidity.
The main artificial source is UV lamps. The light emitted by them is perceived by a person as neon blue. Lamps are usually filled with an inert gas mixed with mercury, which emits ultraviolet light when electrically discharged. By the way, filters are often placed directly on the source of UV radiation itself in order to isolate only a narrow range of waves. nine0006
Ultraviolet radiation of the middle range, not to mention the far and extreme, with prolonged "contact" can adversely affect a person. Therefore, closed UV lamps or protective equipment (at least special goggles) should be used.
"Mandarin in flourescence", oldTor, 2020.
Source: flickr.com
Specialty lenses and digital cameras
Most lenses transmit ultraviolet radiation up to 350 nm. To lower the sensitivity threshold, lenses with glasses containing quartz and fluorites are used. These are Nikon UV-Nikkor 105 mm f/4.5 , Coastal Optics 60 mm f/4.0 , Hasselblad (Zeiss) UV-Sonnar 105 mm and Asahi Pentax Ultra Achromatic Takumar 85 mm f/3.5 .
When using digital, it is sufficient to remove the UV and IR blocking internal filters. However, there are cameras made without them: Nikon D70 , Nikon D40 DSLR and Fujifilm FinePix IS Pro .
Colorants
Certain chemical compounds are capable of absorbing short, high-energy ultraviolet wavelengths and then emitting longer, lower-energy visible wavelengths. With this method, shooting should be carried out in a darkened room, against a black background. The photographer's clothing should also be dark, as light-colored fabrics often fluoresce under UV rays.
"space" V.M., 2014 But here they fix all three ranges of ultraviolet radiation. nine0006
- Color negative film
Particularly susceptible to near (eg Kodak Gold 100, Fujicolor Superia100) and mid range (eg Fujicolor Superia X-tra ISO 800) UV rays. - Black and White Negative Film
Almost all of these films capture radiation below 360 nm, down to x-rays.
Kodak releases High Speed Infrarer , which is three times more sensitive to ultraviolet radiation than regular film. Some photographers use it to take black and white pictures in two ranges at once: IR + UV. nine0006
Combined UV+IR photography.
"Still life in UV+IR", oldTor, 2020. Source: flickr.com
ARTISTIC COMPONENT
In black and white images, objects that reflect ultraviolet will be white, and absorbing - black. When switching to a color photograph, we will get a large number of shades of blue (in IR shooting - red).
This is due to the fact that the range of UV rays lies closer to the blue-violet part of visible radiation (and in the case of IR rays to red) - therefore, matrices and films recognize them in this way. However, you can convert color when changing the white balance, post-processing photos, or using films with an effect. nine0006
UV imaging allows you to explore the world through the eyes of one of the most numerous classes of animals - Insects. The visible range of these creatures is shifted towards shorter wavelengths. With the method of reflected light, patterns on flowers hidden from humans can be detected in photographs: “landing strips” made of pollen, identification marks left by pollinators.
Near ultraviolet (top) and visible light (bottom) photograph.
"Stardust", Don Komarechka. Source: donkon.ca
Insects themselves are also capable of reflecting UV radiation. So, if you photograph a cicada or dragonfly in a dark room, their transparent wings will turn bright blue.
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