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kds315*
Joined: 12 Mar 2008 Posts: 16627 Location: Weinheim, Germany
Expire: 2021-03-09
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Posted: Wed Jul 22, 2020 10:58 am Post subject: Some strange UV lens... |
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kds315* wrote:
Well, there is a special story behind this lens I am going to present here. I got a lens donated for my work by a member here, a very kind and actually very touching story, as I never would have expected that...
So now on to this f4.3/172mm lens, which has a built in blue (?) filter in it [these are not my images, but from the donating member here...]
Now these are some quick test shots hand-holding filters in front of the lens: the blue image is what seemingly it was made for (projecting images to a fluorescent screen I'm guessing), then I took that internal filter out and did an UV shot using a 365nm UV LED (quite sharp image) plus using the Baader-U filter and then a visible light image with suitable VIS-filter (which shows the lens was not computed for that) - all shot wide open at approx f4.
#1
#2
#3
Here now the transmission of that lens: The RED line is the filter alone, the GREEN the lens alone, the BLUE as it came assembled with filter inside. Most likely it was designed to project images onto a fluorescent screen. That built in short pass filter makes me believe that. It is not really UV, but short wave blue, enough to stimulate visible fluorescence.
Again, I am very thankful for the thoughts and donating this lens to me! The one who this goes to knows... _________________ Klaus - Admin
"S'il vient a point, me souviendra" [Thomas Bohier (1460-1523)]
http://www.macrolenses.de for macro and special lens info
http://www.pbase.com/kds315/uv_photos for UV Images and lens/filter info
https://www.flickr.com/photos/kds315/albums my albums using various lenses
http://photographyoftheinvisibleworld.blogspot.com/ my UV BLOG
http://www.travelmeetsfood.com/blog Food + Travel BLOG
https://galeriafotografia.com Architecture + Drone photography
Currently most FAV lens(es):
X80QF f3.2/80mm
Hypergon f11/26mm
ELCAN UV f5.6/52mm
Zeiss UV-Planar f4/60mm
Zeiss UV-Planar f2/62mm
Lomo Уфар-12 f2.5/41mm
Lomo Зуфар-2 f4.0/350mm
Lomo ZIKAR-1A f1.2/100mm
Nikon UV Nikkor f4.5/105mm
Zeiss UV-Sonnar f4.3/105mm
CERCO UV-VIS-NIR f1.8/45mm
CERCO UV-VIS-NIR f4.1/94mm
CERCO UV-VIS-NIR f2.8/100mm
Steinheil Quarzobjektiv f1.8/50mm
Pentax Quartz Takumar f3.5/85mm
Carl Zeiss Jena UV-Objektiv f4/60mm
NYE OPTICAL Lyman-Alpha II f1.1/90mm
NYE OPTICAL Lyman-Alpha I f2.8/200mm
COASTAL OPTICS f4/60mm UV-VIS-IR Apo
COASTAL OPTICS f4.5/105mm UV-Micro-Apo
Pentax Ultra-Achromatic Takumar f4.5/85mm
Pentax Ultra-Achromatic Takumar f5.6/300mm
Rodenstock UV-Rodagon f5.6/60mm + 105mm + 150mm
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Sciolist
Joined: 29 Mar 2017 Posts: 1445 Location: Scotland
Expire: 2021-04-16
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Posted: Wed Jul 22, 2020 1:49 pm Post subject: |
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Sciolist wrote:
Very nice. Enjoy . |
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visualopsins
Joined: 05 Mar 2009 Posts: 10958 Location: California
Expire: 2025-04-11
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Posted: Wed Jul 22, 2020 2:00 pm Post subject: |
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visualopsins wrote:
Hey! That's my American Optical Co. #651 ruler! Oh, wait, mine is here! LOL
Edit: PS -- is there more information about your spectrum graph equipment on your web site? _________________ ☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮ like attracts like! ☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮
Cameras: Sony ILCE-7RM2, Spotmatics II, F, and ESII, Nikon P4
Lenses:
M42 Asahi Optical Co., Takumar 1:4 f=35mm, 1:2 f=58mm (Sonnar), 1:2.4 f=58mm (Heliar), 1:2.2 f=55mm (Gaussian), 1:2.8 f=105mm (Model I), 1:2.8/105 (Model II), 1:5.6/200, Tele-Takumar 1:5.6/200, 1:6.3/300, Macro-Takumar 1:4/50, Auto-Takumar 1:2.3 f=35, 1:1.8 f=55mm, 1:2.2 f=55mm, Super-TAKUMAR 1:3.5/28 (fat), 1:2/35 (Fat), 1:1.4/50 (8-element), Super-Multi-Coated Fisheye-TAKUMAR 1:4/17, Super-Multi-Coated TAKUMAR 1:4.5/20, 1:3.5/24, 1:3.5/28, 1:2/35, 1:3.5/35, 1:1.8/85, 1:1.9/85 1:2.8/105, 1:3.5/135, 1:2.5/135 (II), 1:4/150, 1:4/200, 1:4/300, 1:4.5/500, Super-Multi-Coated Macro-TAKUMAR 1:4/50, 1:4/100, Super-Multi-Coated Bellows-TAKUMAR 1:4/100, SMC TAKUMAR 1:1.4/50, 1:1.8/55
M42 Carl Zeiss Jena Flektogon 2.4/35
Contax Carl Zeiss Vario-Sonnar T* 28-70mm F3.5-4.5
Pentax K-mount SMC PENTAX-A ZOOM 1:3.5 35~105mm, SMC PENTAX ZOOM 1:4 45~125mm
Nikon Micro-NIKKOR-P-C Auto 1:3.5 f=55mm, NIKKOR-P Auto 105mm f/2.5 Pre-AI (Sonnar), Micro-NIKKOR 105mm 1:4 AI, NIKKOR AI-S 35-135mm f/3,5-4,5
Tamron SP 17mm f/3.5 (51B), Tamron SP 17mm f/3.5 (151B), SP 500mm f/8 (55BB), SP 70-210mm f/3.5 (19AH)
Vivitar 100mm 1:2.8 MC 1:1 Macro Telephoto (Kiron)
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kds315*
Joined: 12 Mar 2008 Posts: 16627 Location: Weinheim, Germany
Expire: 2021-03-09
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Posted: Wed Jul 22, 2020 2:07 pm Post subject: |
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kds315* wrote:
Thanks guys!
visualopsins wrote: |
Hey! That's my American Optical Co. #651 ruler! Oh, wait, mine is here! LOL
Edit: PS -- is there more information about your spectrum graph equipment on your web site? |
You mean the spectrometer system I do lens measurements with? It consists of an Ocean Optics USB4000 UV-VIS-NIR spectrometer, a UV-VIS Xenon stabilized Hamamatsu light source, an apochromatic condensor system (to get a thin parallel beam) and an Ocean Optics integration sphere to collect really all light exitinf the measured lens _________________ Klaus - Admin
"S'il vient a point, me souviendra" [Thomas Bohier (1460-1523)]
http://www.macrolenses.de for macro and special lens info
http://www.pbase.com/kds315/uv_photos for UV Images and lens/filter info
https://www.flickr.com/photos/kds315/albums my albums using various lenses
http://photographyoftheinvisibleworld.blogspot.com/ my UV BLOG
http://www.travelmeetsfood.com/blog Food + Travel BLOG
https://galeriafotografia.com Architecture + Drone photography
Currently most FAV lens(es):
X80QF f3.2/80mm
Hypergon f11/26mm
ELCAN UV f5.6/52mm
Zeiss UV-Planar f4/60mm
Zeiss UV-Planar f2/62mm
Lomo Уфар-12 f2.5/41mm
Lomo Зуфар-2 f4.0/350mm
Lomo ZIKAR-1A f1.2/100mm
Nikon UV Nikkor f4.5/105mm
Zeiss UV-Sonnar f4.3/105mm
CERCO UV-VIS-NIR f1.8/45mm
CERCO UV-VIS-NIR f4.1/94mm
CERCO UV-VIS-NIR f2.8/100mm
Steinheil Quarzobjektiv f1.8/50mm
Pentax Quartz Takumar f3.5/85mm
Carl Zeiss Jena UV-Objektiv f4/60mm
NYE OPTICAL Lyman-Alpha II f1.1/90mm
NYE OPTICAL Lyman-Alpha I f2.8/200mm
COASTAL OPTICS f4/60mm UV-VIS-IR Apo
COASTAL OPTICS f4.5/105mm UV-Micro-Apo
Pentax Ultra-Achromatic Takumar f4.5/85mm
Pentax Ultra-Achromatic Takumar f5.6/300mm
Rodenstock UV-Rodagon f5.6/60mm + 105mm + 150mm
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visualopsins
Joined: 05 Mar 2009 Posts: 10958 Location: California
Expire: 2025-04-11
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Posted: Wed Jul 22, 2020 2:16 pm Post subject: |
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visualopsins wrote:
kds315* wrote: |
Thanks guys!
visualopsins wrote: |
Hey! That's my American Optical Co. #651 ruler! Oh, wait, mine is here! LOL
Edit: PS -- is there more information about your spectrum graph equipment on your web site? |
You mean the spectrometer system I do lens measurements with? It consists of an Ocean Optics USB4000 UV-VIS-NIR spectrometer, a UV-VIS Xenon stabilized Hamamatsu light source, an apochromatic condensor system (to get a thin parallel beam) and an Ocean Optics integration sphere to collect really all light exitinf the measured lens |
Nice! Oh no! Now my GAS is acting up...
_________________ ☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮ like attracts like! ☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮
Cameras: Sony ILCE-7RM2, Spotmatics II, F, and ESII, Nikon P4
Lenses:
M42 Asahi Optical Co., Takumar 1:4 f=35mm, 1:2 f=58mm (Sonnar), 1:2.4 f=58mm (Heliar), 1:2.2 f=55mm (Gaussian), 1:2.8 f=105mm (Model I), 1:2.8/105 (Model II), 1:5.6/200, Tele-Takumar 1:5.6/200, 1:6.3/300, Macro-Takumar 1:4/50, Auto-Takumar 1:2.3 f=35, 1:1.8 f=55mm, 1:2.2 f=55mm, Super-TAKUMAR 1:3.5/28 (fat), 1:2/35 (Fat), 1:1.4/50 (8-element), Super-Multi-Coated Fisheye-TAKUMAR 1:4/17, Super-Multi-Coated TAKUMAR 1:4.5/20, 1:3.5/24, 1:3.5/28, 1:2/35, 1:3.5/35, 1:1.8/85, 1:1.9/85 1:2.8/105, 1:3.5/135, 1:2.5/135 (II), 1:4/150, 1:4/200, 1:4/300, 1:4.5/500, Super-Multi-Coated Macro-TAKUMAR 1:4/50, 1:4/100, Super-Multi-Coated Bellows-TAKUMAR 1:4/100, SMC TAKUMAR 1:1.4/50, 1:1.8/55
M42 Carl Zeiss Jena Flektogon 2.4/35
Contax Carl Zeiss Vario-Sonnar T* 28-70mm F3.5-4.5
Pentax K-mount SMC PENTAX-A ZOOM 1:3.5 35~105mm, SMC PENTAX ZOOM 1:4 45~125mm
Nikon Micro-NIKKOR-P-C Auto 1:3.5 f=55mm, NIKKOR-P Auto 105mm f/2.5 Pre-AI (Sonnar), Micro-NIKKOR 105mm 1:4 AI, NIKKOR AI-S 35-135mm f/3,5-4,5
Tamron SP 17mm f/3.5 (51B), Tamron SP 17mm f/3.5 (151B), SP 500mm f/8 (55BB), SP 70-210mm f/3.5 (19AH)
Vivitar 100mm 1:2.8 MC 1:1 Macro Telephoto (Kiron)
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JMC
Joined: 29 May 2018 Posts: 178 Location: London, UK
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Posted: Wed Jul 22, 2020 2:31 pm Post subject: |
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JMC wrote:
Interesting lens Klaus, thanks for sharing. |
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TeemÅ
Joined: 07 Apr 2016 Posts: 586 Location: Australia
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Posted: Wed Jul 22, 2020 5:55 pm Post subject: |
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TeemÅ wrote:
kds315* wrote: |
Thanks guys!
visualopsins wrote: |
Hey! That's my American Optical Co. #651 ruler! Oh, wait, mine is here! LOL
Edit: PS -- is there more information about your spectrum graph equipment on your web site? |
You mean the spectrometer system I do lens measurements with? It consists of an Ocean Optics USB4000 UV-VIS-NIR spectrometer, a UV-VIS Xenon stabilized Hamamatsu light source, an apochromatic condensor system (to get a thin parallel beam) and an Ocean Optics integration sphere to collect really all light exitinf the measured lens |
Sounds very intriguing! If you had some comparable lenses (such as 50mm F1.4's) from different brands of the same period, and also any early coated lenses (thinking just post-WW2) - or even early coated binoculars - it would be very interesting to see if any understanding could be gained from comparing their results on the spectrometer, to see the transmission curves of their coatings. Even tests of different polarising filters could be interesting as most people assume them to work the same and be of equal quality.
I guess such a system runs into several thousands of dollars quite quickly. Are there any affordable units that would be suitable for a hobbyist? |
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kds315*
Joined: 12 Mar 2008 Posts: 16627 Location: Weinheim, Germany
Expire: 2021-03-09
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Posted: Wed Jul 22, 2020 9:19 pm Post subject: |
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kds315* wrote:
TeemÅ wrote: |
kds315* wrote: |
Thanks guys!
visualopsins wrote: |
Hey! That's my American Optical Co. #651 ruler! Oh, wait, mine is here! LOL
Edit: PS -- is there more information about your spectrum graph equipment on your web site? |
You mean the spectrometer system I do lens measurements with? It consists of an Ocean Optics USB4000 UV-VIS-NIR spectrometer, a UV-VIS Xenon stabilized Hamamatsu light source, an apochromatic condensor system (to get a thin parallel beam) and an Ocean Optics integration sphere to collect really all light exitinf the measured lens |
Sounds very intriguing! If you had some comparable lenses (such as 50mm F1.4's) from different brands of the same period, and also any early coated lenses (thinking just post-WW2) - or even early coated binoculars - it would be very interesting to see if any understanding could be gained from comparing their results on the spectrometer, to see the transmission curves of their coatings. Even tests of different polarising filters could be interesting as most people assume them to work the same and be of equal quality.
I guess such a system runs into several thousands of dollars quite quickly. Are there any affordable units that would be suitable for a hobbyist? |
This IS the affordable solution!! Well, a little less if using a USB2000 (which I had before)... _________________ Klaus - Admin
"S'il vient a point, me souviendra" [Thomas Bohier (1460-1523)]
http://www.macrolenses.de for macro and special lens info
http://www.pbase.com/kds315/uv_photos for UV Images and lens/filter info
https://www.flickr.com/photos/kds315/albums my albums using various lenses
http://photographyoftheinvisibleworld.blogspot.com/ my UV BLOG
http://www.travelmeetsfood.com/blog Food + Travel BLOG
https://galeriafotografia.com Architecture + Drone photography
Currently most FAV lens(es):
X80QF f3.2/80mm
Hypergon f11/26mm
ELCAN UV f5.6/52mm
Zeiss UV-Planar f4/60mm
Zeiss UV-Planar f2/62mm
Lomo Уфар-12 f2.5/41mm
Lomo Зуфар-2 f4.0/350mm
Lomo ZIKAR-1A f1.2/100mm
Nikon UV Nikkor f4.5/105mm
Zeiss UV-Sonnar f4.3/105mm
CERCO UV-VIS-NIR f1.8/45mm
CERCO UV-VIS-NIR f4.1/94mm
CERCO UV-VIS-NIR f2.8/100mm
Steinheil Quarzobjektiv f1.8/50mm
Pentax Quartz Takumar f3.5/85mm
Carl Zeiss Jena UV-Objektiv f4/60mm
NYE OPTICAL Lyman-Alpha II f1.1/90mm
NYE OPTICAL Lyman-Alpha I f2.8/200mm
COASTAL OPTICS f4/60mm UV-VIS-IR Apo
COASTAL OPTICS f4.5/105mm UV-Micro-Apo
Pentax Ultra-Achromatic Takumar f4.5/85mm
Pentax Ultra-Achromatic Takumar f5.6/300mm
Rodenstock UV-Rodagon f5.6/60mm + 105mm + 150mm
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Lightshow
Joined: 04 Nov 2011 Posts: 3666 Location: Calgary
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Posted: Wed Jul 22, 2020 10:22 pm Post subject: |
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Lightshow wrote:
Congratulations on the lens, and thanks to the benefactor. _________________ A Manual Focus Junky...
One photographers junk lens is an artists favorite tool.
My lens list
http://www.flickr.com/photos/lightshow-photography/ |
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visualopsins
Joined: 05 Mar 2009 Posts: 10958 Location: California
Expire: 2025-04-11
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Posted: Wed Jul 22, 2020 10:56 pm Post subject: |
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visualopsins wrote:
kds315* wrote: |
TeemÅ wrote: |
kds315* wrote: |
Thanks guys!
visualopsins wrote: |
Hey! That's my American Optical Co. #651 ruler! Oh, wait, mine is here! LOL
Edit: PS -- is there more information about your spectrum graph equipment on your web site? |
You mean the spectrometer system I do lens measurements with? It consists of an Ocean Optics USB4000 UV-VIS-NIR spectrometer, a UV-VIS Xenon stabilized Hamamatsu light source, an apochromatic condensor system (to get a thin parallel beam) and an Ocean Optics integration sphere to collect really all light exitinf the measured lens |
Sounds very intriguing! If you had some comparable lenses (such as 50mm F1.4's) from different brands of the same period, and also any early coated lenses (thinking just post-WW2) - or even early coated binoculars - it would be very interesting to see if any understanding could be gained from comparing their results on the spectrometer, to see the transmission curves of their coatings. Even tests of different polarising filters could be interesting as most people assume them to work the same and be of equal quality.
I guess such a system runs into several thousands of dollars quite quickly. Are there any affordable units that would be suitable for a hobbyist? |
This IS the affordable solution!! Well, a little less if using a USB2000 (which I had before)... |
The light source costs $$$-$$$$ too! Whole system about same as good camera. Folks with access to university and/or corporate labs may find comparable equipment. _________________ ☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮ like attracts like! ☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮
Cameras: Sony ILCE-7RM2, Spotmatics II, F, and ESII, Nikon P4
Lenses:
M42 Asahi Optical Co., Takumar 1:4 f=35mm, 1:2 f=58mm (Sonnar), 1:2.4 f=58mm (Heliar), 1:2.2 f=55mm (Gaussian), 1:2.8 f=105mm (Model I), 1:2.8/105 (Model II), 1:5.6/200, Tele-Takumar 1:5.6/200, 1:6.3/300, Macro-Takumar 1:4/50, Auto-Takumar 1:2.3 f=35, 1:1.8 f=55mm, 1:2.2 f=55mm, Super-TAKUMAR 1:3.5/28 (fat), 1:2/35 (Fat), 1:1.4/50 (8-element), Super-Multi-Coated Fisheye-TAKUMAR 1:4/17, Super-Multi-Coated TAKUMAR 1:4.5/20, 1:3.5/24, 1:3.5/28, 1:2/35, 1:3.5/35, 1:1.8/85, 1:1.9/85 1:2.8/105, 1:3.5/135, 1:2.5/135 (II), 1:4/150, 1:4/200, 1:4/300, 1:4.5/500, Super-Multi-Coated Macro-TAKUMAR 1:4/50, 1:4/100, Super-Multi-Coated Bellows-TAKUMAR 1:4/100, SMC TAKUMAR 1:1.4/50, 1:1.8/55
M42 Carl Zeiss Jena Flektogon 2.4/35
Contax Carl Zeiss Vario-Sonnar T* 28-70mm F3.5-4.5
Pentax K-mount SMC PENTAX-A ZOOM 1:3.5 35~105mm, SMC PENTAX ZOOM 1:4 45~125mm
Nikon Micro-NIKKOR-P-C Auto 1:3.5 f=55mm, NIKKOR-P Auto 105mm f/2.5 Pre-AI (Sonnar), Micro-NIKKOR 105mm 1:4 AI, NIKKOR AI-S 35-135mm f/3,5-4,5
Tamron SP 17mm f/3.5 (51B), Tamron SP 17mm f/3.5 (151B), SP 500mm f/8 (55BB), SP 70-210mm f/3.5 (19AH)
Vivitar 100mm 1:2.8 MC 1:1 Macro Telephoto (Kiron)
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pdccameras
Joined: 23 Aug 2009 Posts: 825 Location: Putnam, CT
Expire: 2014-08-11
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Posted: Thu Jul 23, 2020 3:38 am Post subject: |
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pdccameras wrote:
Bravo, Klaus! Glad to see the great images you pulled out of this lens! BTW, the ruler was my father-in-law's. He worked his whole life in the research optical shop at AO in Southbridge, MA. He recently passed away.
All the best,
Paul _________________ Canon 5D Mii, Canon 40D, Canon 350D IR, Sony A7 Mii, Sony Alpha-6000, a ton of lenses: AF & MF and too many cameras to count, all formats: 110 - 4x5. |
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DConvert
Joined: 12 Jun 2010 Posts: 921 Location: Essex UK
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Posted: Thu Jul 23, 2020 7:34 am Post subject: |
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DConvert wrote:
visualopsins wrote: |
The light source costs $$$-$$$$ too! Whole system about same as good camera. Folks with access to university and/or corporate labs may find comparable equipment. |
Yes the source for the UV/vis spectrometer at work cost ~£450 an lasts on average about 18 months.
I make use of the spectrometer for looking at some of my photographic kit it works well for most filters (the sample beam is partly polarized so it's not ideal for polarizing filters) but as it lacks an integrating sphere it's not so good for lenses. |
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kds315*
Joined: 12 Mar 2008 Posts: 16627 Location: Weinheim, Germany
Expire: 2021-03-09
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Posted: Thu Jul 23, 2020 8:00 pm Post subject: |
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kds315* wrote:
pdccameras wrote: |
Bravo, Klaus! Glad to see the great images you pulled out of this lens! BTW, the ruler was my father-in-law's. He worked his whole life in the research optical shop at AO in Southbridge, MA. He recently passed away.
All the best,
Paul |
Thanks again Paul for your generous donation and my sincere condolences to the passing of your father-in-law!
I'm sure he would have been a wealth of information on lenses! _________________ Klaus - Admin
"S'il vient a point, me souviendra" [Thomas Bohier (1460-1523)]
http://www.macrolenses.de for macro and special lens info
http://www.pbase.com/kds315/uv_photos for UV Images and lens/filter info
https://www.flickr.com/photos/kds315/albums my albums using various lenses
http://photographyoftheinvisibleworld.blogspot.com/ my UV BLOG
http://www.travelmeetsfood.com/blog Food + Travel BLOG
https://galeriafotografia.com Architecture + Drone photography
Currently most FAV lens(es):
X80QF f3.2/80mm
Hypergon f11/26mm
ELCAN UV f5.6/52mm
Zeiss UV-Planar f4/60mm
Zeiss UV-Planar f2/62mm
Lomo Уфар-12 f2.5/41mm
Lomo Зуфар-2 f4.0/350mm
Lomo ZIKAR-1A f1.2/100mm
Nikon UV Nikkor f4.5/105mm
Zeiss UV-Sonnar f4.3/105mm
CERCO UV-VIS-NIR f1.8/45mm
CERCO UV-VIS-NIR f4.1/94mm
CERCO UV-VIS-NIR f2.8/100mm
Steinheil Quarzobjektiv f1.8/50mm
Pentax Quartz Takumar f3.5/85mm
Carl Zeiss Jena UV-Objektiv f4/60mm
NYE OPTICAL Lyman-Alpha II f1.1/90mm
NYE OPTICAL Lyman-Alpha I f2.8/200mm
COASTAL OPTICS f4/60mm UV-VIS-IR Apo
COASTAL OPTICS f4.5/105mm UV-Micro-Apo
Pentax Ultra-Achromatic Takumar f4.5/85mm
Pentax Ultra-Achromatic Takumar f5.6/300mm
Rodenstock UV-Rodagon f5.6/60mm + 105mm + 150mm
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