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

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

Tuesday, January 1, 2019

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

Monday, December 31, 2018

Oncostele Wildcat 'Golden Red Star' in visible, reflected UV, simulated bee and butterfly vision - differentials

Today shots of an Orchid hybride, Oncostele Wildcat 'Golden Red Star' in reflected ultraviolet photography as well as simulated bee and butterfly vision  - but also in differential ("psychedelic") presentation. UV filter used was the Baader-U filter, my "work horse" filter for reflected UV as well as my proprietary XBV filters. All shots were done at f8 using an UV-Nikkor f4.5/105mm lens. Light source used was a modified for high UV output Xenon flash.

[click on image to see a larger one]

Human Vision (VIS):
 

Reflected UV (Baader-U):
 

Simulated Butterfly Vision:
 

Simulated Bee Vision:
 

Human Vision (VIS) - Ultraviolet (UV) Differential:
 

Simulated Butterfly Vision (BU) - Ultraviolet (UV) Differential:
 

Simulated Bee Vision (Bee) - Ultraviolet (UV) Differential:
 

This orchid has a very specific UV pattern, its petals are very UV dark, but its lower petal lip has on the lower center a very UV bright spot as well as on its center "nose" formation an UV reflecting spot and all this gets nicely visible, also in Differential form (UV reflection shows as light blue)

I have written more about this orchid HERE and about Differentials 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

Saturday, December 29, 2018

Oncostele orchid in visible, reflected UV, UV-Nikkor vs Quartz Fluoride lens - psychedelic

I have done shots of an Orchid hybride, Oncostele Wildcat 'Golden Red Star' in reflected ultraviolet photography using an UV-Nikkor f4.5 / 105mm lens in comparison to an older f3.2 / 81mm Quartz Fluoride Condensor lens from an older UV-VIS spectrometer system before here. UV filter used was the Baader-U filter, my "work horse" filter for reflected UV. All shots were done at approx. f8. Light source used was a modified for high UV output Xenon flash.

Now today I'd like to show differential of those VIS and UV images, making strinkingly visible the difference, hence why I call those images "psychedelic"....

[click on image to see a larger one]

UV-Nikkor 105mm Lens: 

Human Vision (VIS):
 

Reflected UV (Baader-U):
 

Psychedelic (Differential VIS-UV):
 


Quartz Fluoride Condensor Lens 81mm: 

Human Vision (VIS):
 

Reflected UV (Baader-U):
 


Psychedelic (Differential VIS-UV):
 

This orchid has a very specific UV pattern, its petals are very UV dark, but its lower petal lip has on the lower center a very UV bright spot as well as on its center "nose" formation an UV reflecting spot and all this gets nicely visible, also in this psychedelic differential presentation, on both used lenses.

I have written more about this orchid HERE  and more about that old quartz fluoride condensor lens HERE.

More such psychedelic differential images may be see 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

Thursday, December 27, 2018

Oncostele orchid in visible, reflected UV, simulated bee and butterfly vision UV-Nikkor vs Quartz Fluoride lens

Today shots of an Orchid hybride, Oncostele Wildcat 'Golden Red Star' in reflected ultraviolet photography as well as simulated bee and butterfly vision using an UV-Nikkor f4.5 / 105mm lens in comparison to an older f3.2 / 81mm Quartz Fluoride Condensor lens from an older UV-VIS spectrometer system. A variable aperture was added to the Quartz Fluoride Condensor lens to allow stopping down. UV filter used was the Baader-U filter, my "work horse" filter for reflected UV as well as my proprietary XBV filters for simulated bee and butterfly vision. All shots were done at approx. f8. Light source used was a modified for high UV output Xenon flash.

[click on image to see a larger one]

UV-Nikkor 105mm Lens: 

Human Vision (VIS):
 

Reflected UV (Baader-U):
 

Simulated Butterfly Vision:
 

Simulated Bee Vision:
 

Quadriptych of VIS, UV, sim. Butterfly and Bee vision (left to right, top to bottom):
 


Quartz Fluoride Condensor Lens 81mm: 

Human Vision (VIS):
 

Reflected UV (Baader-U):
 


Simulated Butterfly Vision:
 

Simulated Bee Vision:
 

Quadriptych of VIS, UV, sim. Butterfly and Bee vision (left to right, top to bottom):
 

This orchid has a very specific UV pattern, its petals are very UV dark, but its lower petal lip has on the lower center a very UV bright spot as well as on its center "nose" formation an UV reflecting spot and all this gets nicely visible, also in simulated Bee and Butterfly vision, on both used lenses.

The lenses itself 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).

I have written more about this orchid HERE  and more about that old quartz fluoride condensor 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

Thursday, December 20, 2018

NOVOFLEX T-NOFLEXAR 400mm for reflected ultraviolet (UV) photography


So today it is about a lens I had laying around for many years, intended to use for reflected ultraviolet photography, as it is a simple achromat from what I know, the NOVOFLEX T-NOFLEXAR 5.6/400mm.

To find out if there is a chance to get it to work, best aside from just trying out, to chech with a suitable spectrometer if there is some useful UV transmission - and this will be shown here. As a comparison, I will use two other lenses, both well known to work in UV, the Kuribayashi 3.4/35mm and the NOFLEXAR 3.5/35mm lens (also made by NOVOFLEX).

[click on image to see a larger one]


Now this transmission spectra clear shows, that althought The T-Noflexar 400mm cannot beat the Kuribayashi 35mm lens, it is very close to the Noflexar 35mm lens transmission, which is considered quite useful for reflected UV photography. It delivers about 67% transmission at 365nm, the Kuribayashi does 78% there.

Remark: the 100% line reflects the transmission of a white SPECTRALON (R) reflection standard with 99% reflection in the 300-700nm region, so this result should be a true representation of the lens transmission.

I will shoot a few test images in visible light and UV, weather permitting. It is dull grey winter weather now, so that might be in coming spring...


I have written about lenses for UV before 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