Tuesday, January 8, 2019

Russian Telegoir f2.8 / 200mm prototype lens for reflected ultraviolet (UV) and infrared (IR) photography

Today more tests shots in reflected ultraviolet and infrared photography with an older Russian multicoated Telegoir f2.8/200mm prototype lens, designed in 1975 and built 1991. UV filter used was a Schott UG1 + BG38 filter stack, as well as a B+W 092 (Schott 695nm) IR filter. All shots were done at f5.6. Light source used was sunlight on a rather grey day.

[click on image to see a larger one]

Visible Light:

Schott UG1+BG38 filter:

Schott IR filter:

VIS and UV image side-side:

VIS and IR image side-side:

This Telegoir lens has despite its modern MC coating a surprisingly useful UV transmission as well as for IR. A further feature seems to be that this lens has a very small focus shift in UV as well as in IR of less than 1%!

I have written about this lens HERE.

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