I am looking to do some UV only photography with tropical frogs. We ran some test shoots using an old interfit EX150 flash light, Camera was a full-spectrum modified Nikon D2x and a Nikkor 50mm f1.8 AF-D lens, some photos taken with a PK-13 extension tube. Attached to the lens was a B+W F-Pro Infrared Cut Filter, and a BG-40/BG39/BG38/UG-11 UV Pass Filter. The next steps would be to find a standard.
Would titanium oxide and carbon black be good substitutes for the expensive reflectance standards? Would I then need to measure the reflectance and could I do this with a spectrometer or would that only give me absorbance? I am also wondering if I would need to standardise the light source, is this possible with a flash and how would I do this?
Many thanks in advance,
T
Hi,
Titanium oxide and carbon should work well as standards, and a spectrophotometer can accurately describe the reflectance profile. Similarly, a spectrophotometer can be used to characterize the spectral property of your light source. To measure a flashlight, it would be necessary to find out how to make an ‘event-triggered’ measurement or sample repeatedly across very short time intervals.
Cheers,
Cedric