Andrea B. Posted June 4, 2017 Share Posted June 4, 2017 I had to try this.Conclusions may be drawn by the interested reader. Kindly Note: I like and use all the 4 filters in this test. I'm not out to show up one against the other. I consider each filter well made and good for general UV photography. I was simply curious as to what such a test might show. Gear:Nichia 365nm UV-Led Flashlight on Low PowerIt is hard to stare down the barrel of a Nichia 365nm UV-Led torch without serious blowout. I used the lowest power setting on my torch, but even then it was tricky. So I turned the torch a bit to the side. If that is not a valid idea, let me know. I'm wingin' it here![*]UV-Nikkor 105/4.5All shots made at f/11.[*]D610-broadbandISO-400.Monochrome[0] picture control. I didn't want colour to obscure the result.[*]In total darkness, so no ambient UV.WEARIN' ME LI'L' GOGGLETS, YEAH. U must do this or else...!![*]The initial spot-metered reading for all 4 filters in Live View was the same at 2.5".I ran a series of 4 more faster stops over that.Metering is tricky when staring down the barrel of a UV-Led torch,but we have to start somewhere..Filters in alphabetical orderBaaderU350FWHM60 [320-380nm]85% trans rate at peak[*]KolariU365FWHM40 [340-380 on website, but 345-85?]50% trans rate at peak[*]StraightEdgeU 379FWHM43? [342-385nm, peak shifted right within that range]85% trans rate at peak[*]U-360 (2mm) + S8612 (2mm)365FWHM60 [325-385nm estimated from charts]60% trans rate at peak(You could use a 1.5mm thick S8612 and raise that trans rate. I'm in the land of overkill using a 2mm thick S8612.)The two highest transmitting filters at peak are the BaaderU (85% @ 350nm) and the StraightEdgeU (85% @ 379nm). But the UV-Led has a peak at 365nm. We therefore conclude .The lowest transmitting filters at peak are the KolariU (50% @ 365nm) and the U-360 stack (60% @ 360nm). These two filters best match the UV-Led peak at 365nm. We therefore conclude .The individual photos were center-cropped, labeled, resized and converted to TIFs in Photo Mechanic.The composite was constructed in PSE 11. No other edits were applied.This composite is 1500 x 1200 pixels if clicked up. Link to comment
Cadmium Posted June 4, 2017 Share Posted June 4, 2017 Andrea, I don't see much difference in any of these shots per exposure times. Am I suppose to? Link to comment
Andrea B. Posted June 5, 2017 Author Share Posted June 5, 2017 I didn't see any difference either.This test was an attempt to mimic the similar test on Kolari Vision's blog.https://kolarivision...uv-filter-test/ That test was made with a lens which does not transmit UV as well as would a dedicated UV lens. Upon seeing that test, I immediately wondered what would happen if I used the UV-Nikkor to shoot down the barrel of a UV-Led flashlight. Then went and did it. Link to comment
Cadmium Posted June 5, 2017 Share Posted June 5, 2017 Well, in general, testing with such LED's is Sanpaku. Link to comment
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