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

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

Today tests shots in reflected ultraviolet photography of an Oncostele orchid 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. All shots were done at f5.6. Light source used was a modified Xenon flash as well as a Nichia high power UV LED emitting at 365nm.

[click on image to see a larger one]

Schott UG1+BG38 filter stack with Xenon flash:
 

Schott UG1+BG38 filter stack with UV LED:
 

Schott UG1+BG38 filter stack with UV LED whitebalanced:
 

Visible light image:
 

VIS and UV image side-side:
 

This Telegoir lens has despite its MC coating a surprisingly high UV transmission and I will try it out outside, once weather is permitting. A further feature seems to be that this lens has a very small focus shift!

I have shown more about this flower in UV HERE

Outdoor shots in UV and IR using 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

ISCO Cine Projection lens for reflected ultraviolet (UV) photography

To start this year 2019, today tests shots in reflected ultraviolet photography of an Oncostele orchid with a modern German high speed ISCO f2/100mm movie projection lens. UV filter used was a Schott UG1 + BG38 filter stack as well as my work horse UV transmission filter, the Baader-U. All shots were done at f2 as this lens has no iris. Light source used was a modified Xenon flash.

[click on image to see a larger one]

Schott UG1+BG38 filter stack:
 

Baader-U filter:
 

This ISCO lens has despite its MC coating a surprising high UV transmission and I will certainly elaborate more on those type of lenses!

 
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

Treasury flower - Gazania rigens in deep reflected ultraviolet photography III

Today about the same Gazania flower Treasury flower - Gazania rigens in reflected ultraviolet photography using my "work horse" UV filter, the Baader-U filter, but this time comparing them to two other UV transmitting filters, a stack for longer wave UV using Schott UG1 and one for shorter using Schott UG11 plus as IR blocker Schott S8612 filter. But this time every image was individually white balanced. Lens used was the 94mm CERCO quartz fluorite lens. Light source was a modified for UV high power Xenon flash.

[click on image to see a larger one]

Visible light image using UV/IR cut filter:
 

UV image using Baader-U filter (approx. 320-395nm, effective peak approx. 375nm):
 

UV image using a UG11 filter stack:
 

UV image using Jupiter-U filter:
 

UV image using a UG1 filter stack:
 


Interesting to notice, that those very different UV filters produce quite similar results, the deeper into UV reaching ones with finer details, the one rather on the long wave UV end, like the UG1 based filter stack shows less details and tints the image bluish, the latter most likely because of some blue leakage. Seemingly the UG11 + S8612 filter stack as well as the Jupiter-U filter produces quite similar detailled results than the Baader-U filter, but need more exposure and show some greenish overall hue. All that gets nicely visible.

I have written about that flower and those filters previously 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

Treasury flower - Gazania rigens in deep reflected ultraviolet photography II

Today about the same Gazania flower Treasury flower - Gazania rigens in reflected ultraviolet photography using my "work horse" UV filter, the Baader-U filter, but this time comparing them to two other UV transmitting filters, a stack for longer wave UV using Schott UG1 and one for shorter using Schott UG11 plus as IR blocker Schott S8612 filter. Lens used was the 94mm CERCO quartz fluorite lens. Light source was a modified for UV high power Xenon flash.

[click on image to see a larger one]

Visible light image using UV/IR cut filter:
 

UV image using Baader-U filter (approx. 320-395nm, effective peak approx. 375nm):
 

UV image using a UG1 filter stack:
 

UV image using a UG11 filter stack:
 


Interesting to notice, that those UV marks gets more or less visible using also those two filter stacks, however the shorter wave one has a clear edge over the longer wave one, revealing much finer details, and that all gets nicely visible.

There is a follow-up article about those filters, using individual white balance HERE.

I have written about that flower previously 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