ulf Posted June 13, 2023 Share Posted June 13, 2023 I have lately bought a few more Canon TS-E lenses to complement the TS-E 24mm I got a long time ago. My goal was mainly to use them for NIR Photography. After my last published topic Kai asked for information about the UV-reach. https://www.ultravioletphotography.com/content/index.php?/topic/5846-a-visit-to-borgeby-slott/#comment-62641 Here is the result of a sloppy quick test without a high power light source and integrating sphere. I just used a collimated beam from my deuterium light source and then scaled the graphs "to taste" to a level I guess is reasonably correct. The measurements as usual made with my Ocean Optics Flame wide-band UV-VIS-NIR spectrometer. Due to the truncated light-source there is only valid information up to the violet band. Here I only present a narrow wavelength-band with the valid information in the mid part. Tested lenses and their graphs are Canon TS-E 24/3.5 L. Purple Canon TS-E 45/2.8. Red Canon TS-E 90/2.8 Black It seams like all three lenses are marginally usable for UV, but that the TS-E 90mm is best. Link to comment
Kai Posted June 14, 2023 Share Posted June 14, 2023 Excellent - many thanks, Ulf! This helps me a lot to classify my own preliminary measurements. The TS-E 90mm is therefore not a good UV lens, but - if you use the tilt or shift function - it is just as useful as it is unique. Link to comment
ulf Posted June 14, 2023 Author Share Posted June 14, 2023 1 hour ago, Kai said: Excellent - many thanks, Ulf! This helps me a lot to classify my own preliminary measurements. The TS-E 90mm is therefore not a good UV lens, but - if you use the tilt or shift function - it is just as useful as it is unique. You are welcome. I do not feel these lenses are worthy an extensive proper absolute transmission analysis as they are so marginal for UV. Your images very clearly showed how superior the new TS-E 90mm L lens is. The false UV-yellow from that lens was much more saturated and it had much less transversal chromatic aberration. Link to comment
photoni Posted June 17, 2023 Share Posted June 17, 2023 P.S. my Nikkor PC-E 45mm and PC-E 85mm (new version with electronic diaphragm) are not good for UV... Link to comment
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