Equipment and techniques Ultraviolet photography

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a portrait taken using uv light between wavelengths of 335 , 365 nanometers.


in reflected uv photography subject illuminated directly uv emitting lamps (radiation sources) or strong sunlight. uv transmitting filter placed on lens, allows ultraviolet light pass , absorbs or blocks visible , infrared light. uv filters made special colored glass , may coated or sandwiched other filter glass aid in blocking unwanted wavelengths. examples of uv transmission filters baader-u filter or straightedgeu ultraviolet bandpass filter, both of exclude visible , infrared light. older filters include kodak wratten 18a, b+w 403, hoya u-340 , kenko u-360 of need used in conjunction additional infrared blocking filter. typically such ir blocking, uv transmissive filters made schott bg-38, bg-39 , bg-40 glass. filters use digital camera sensors must not have infrared leak (transmission in infrared spectrum); sensor pick reflected infrared radiation ultraviolet, may obscure details resolved ultraviolet alone.


most types of glass allow longwave uv pass, absorb other uv wavelengths, 350 nm , below. uv photography necessary use specially developed lenses having elements made fused quartz or quartz , fluorite. lenses based purely on quartz show distinct focus shift between visible , uv light, whereas fluorite/quartz lenses can corrected between visible , ultraviolet light without focus shift. examples of latter type nikon uv-nikkor 105 mm f/4.5, coastal optics 60 mm f/4.0, hasselblad (zeiss) uv-sonnar 105 mm, , asahi pentax ultra achromatic takumar 85 mm f/3.5


suitable digital cameras reflected uv photography have been reported (unmodified) nikon d70 or d40 dslrs, many others suitable after having internal uv , ir blocking filter removed. fujifilm finepix pro digital slr camera purpose-designed ultraviolet (and infrared) photography, frequency response rated 1000-380 nm, although responds longer , shorter wavelengths. silicon (from dslr sensors made) can respond wavelengths between 1100-190 nm.


uv induced fluorescence photography

fluorescent materials lit uv light. no filter used absorb violet visible light. photo taken daylight film


photography based on visible fluorescence induced uv radiation uses same ultraviolet illumination in reflected uv photography. however, glass barrier filter used on lens must absorb or block ultraviolet , infrared light , must permit visible radiation pass. visible fluorescence produced in suitable subject when shorter, higher energy ultraviolet wavelengths absorbed, lose energy , emitted longer, lower energy visible wavelengths.


uv induced visible fluorescence photography must take place in darkened room, preferably black background. photographer should wear dark-colored clothes better results. (many light-colored fabrics fluoresce under uv.) camera or lens may used because visible wavelengths being recorded.


uv can induce infrared fluorescence , uv fluorescence depending on subject. uv induced non-visible fluorescence photography, camera must modified in order capture uv or ir images, , uv or ir capable lenses must used.


filters added uv illumination source narrow illuminant waveband. filter called exciter filter, , allows radiation pass needed induce particular fluorescence. before, barrier filter must placed in front of camera lens exclude undesired wavelengths.








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