UFAR-12 41mm f/2.5 quartz fluorite lens does cobweb hens & chicks flowering

Well, some long time ago I had mentioned that I was able to "liberate" the two last survived multispectral quartz fluorite lenses UFAR-12 f2.5/41mm from the russian mission to Mars. Made by LOMO and designed by GOI, they represent (to me) a top result of the designers under Prof. Volossov who headed the optical design department of GOI in St Petersburg. Transmission of that lens is flat approx. 65% for 330...1000nm. Center resolution is approx. 80lpm

And today I took it out again and took some shots on my balcony, as there were some succulent Cobweb Hens & Chicks were starting to flower....

[click on image to see a larger one]

Human Vision (400-700nm):



Ultraviolet Vision (310-390nm):



Quite nice resolution this lens shows and it has a pretty good UV transmission, too which I have measured a while ago.

Stay tuned, more will follow on that fascinating subject...

More info on this very interesting field may be found on my site http://www.pbase.com/kds315/uv_photos

A few quartz flourite UV lenses on the bench for lens transmission measurements

As I was taking some measurements with the Coastal Optics UV-VIS-NIR Apo 60mm, I thought why not also testing a few other fully color-corrected lenses while I'm at it... (forgot the Coastal Optics 105mm, unfortunately...)

[click on image to see a larger one]


[validity: approx 310 - 750nm]
Interesting to note, how similar the older designs (Zeiss UV-Sonnar 105mm and LOMO UFAR-12 41mm) are, but the Pentax Ultra Achromatic Takumar 85mm has a notch in terms of transmission. Then comes the UV-Nikkor 105mm and the newer CERCO 94mm; the newest and best being the most advanced development, the Coastal Optics UV-VIS-NIR Apo 60mm.

Stay tuned, more will follow on that fascinating subject...

More info on this very interesting field may be found on my site http://www.pbase.com/kds315/uv_photos

Russian UFAR Mars Lens meets Rudbeckia fulgida

Well, some long time ago I had mentioned that I was able to "liberate" the two last survived multispectral quartz fluorite lenses from the russian mission to Mars. Made by LOMO and designed by GOI, they represent (to me) a top result of the designers under Prof. Volossov who headed the optical design department of GOI in St Petersburg. Transmission of that lens is flat approx. 65% for 230...1000nm. Center resolution is approx. 80lpm

Long story short, here now some results using that no-focusshift lens...

[click on image to see a larger one]

Human Vision (400-700nm):



Ultraviolet Vision (310-390nm):



(Simulated) Butterfly Vision using XBV2 filter:



Here a detail crop showing the very high resolution of that lens:




Stay tuned, more will follow on that fascinating subject...

More info on this very interesting field may be found on my site http://www.pbase.com/kds315/uv_photos