Reflected UV photography 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.








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