Using an older Quartz Fluoride Condensor as a taking lens

[kds315*]

A while ago, on my search for affordable lenses for reflected UV photography, I discovered in an older UV-VIS spectrometer system some seemingly useful Quartz Fluoride Lens system (QFC) of approximately f3.2 / 81mm. It had to be modified to convince it to work with a camera, and also a variable aperture had to be added, but I succeeded finally to get it to work on a mft camera system.

So today a comparision between my "work horse" UV-Nikkor f4.5/105mm (top) and this QFC f3.2/81mm (botttom):





Both images are a Quadriptych of VIS, reflected UV, sim. Butterfly and Bee vision (left to right, top to bottom)

Both lenses differ in focal length, 105mm for the UV-Nikkor vs 81mm for the Quartz Fluoride Condensor lens, and lens speed f4.5 vs f3.2 but other than that they are quite comparable: there is hardly any focus shift, just sharpness and contrast is higher with the rather expensive UV-Nikkor lens compared to the Quartz Fluoride Condensor lens, quite as expected. Other than that this old lens does very well, but it only covers mft sensor format, possibly APS-C (with another modification).

[jamaeolus]

Really interesting shots. Beautiful work.

I find it odd that some of the photos on this site will not show in chrome (most do!) so I went to microsfts browser to view them.

[visualopsins]

Firefox works

[jamaeolus]

Thanks visualopsins for the Firefox tip, 99% of the time chrome works for me. I am viewing this on my galaxy tab t800 using chrome (at home) and it works just fine. But on only one of the 2 workstations running chrome on a Microsoft OS windows 10 desktop which I use at work, every once in a while it fails. I like chrome because I use several different devices and it syncs all my stuff. Maybe I should try Firefox again though. I use to know how to clear the cache sometimes that fixes the issues. Anyways great photos Klaus (as always! I confess that I envy your skills)

[kds315*]

Thanks! I use Firefox (latest version) on my MS 10 running Surface Pro and it just works fine, also synchs with my Firefox on my MS Server, with no issue - except it consumes quite some memory when having multiple windows open.