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kymarto
Joined: 30 Nov 2016 Posts: 406 Location: Portland, OR and Milan, Italy
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Posted: Sat Feb 13, 2021 10:51 pm Post subject: Wollensak Fototel 20 inch f6.3 first test |
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kymarto wrote:
This is Wollensak's licensing of the De Oude Delft Fototel mirror lens, introduced in 1953. Mine is is nearly mint condition, and appears to be a prototype or first "edition", because within a year they had changed the external appearance. It seems reasonably sharp, and has pretty good contrast. One interesting thing is that it focuses by moving the front lens/mirror, rather than the whole lens like my Nikkor 500mm/f5. It has a very good MFD, and the image does not fall apart close up as the Nikkor's image does. The orange flower image is MFD, the others close to that. I will try it later at further distances when I have a subject. These are SOOC, metered for highlights, just as ACR thinks they should be, although as posted they exceed safe chroma values.
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_________________ Vintage lens aficionado |
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Doc Sharptail
Joined: 23 Nov 2020 Posts: 1161 Location: Winnipeg Canada
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Posted: Sat Feb 13, 2021 11:23 pm Post subject: |
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Doc Sharptail wrote:
Got a photo of the lens?
Interesting. First came across the Wollensak name with early Winchester rifle scopes- the first "A" series...
Winchester assembled the scopes with Wollensak made lenses.
No slouches as straight up camera lenses either.
-D.S. _________________
D-810, F2, FTN.
35mm f2 O.C. nikkor
50 f2 H nikkor, 50 f 1.4 AI-s, 135 f3.5 Q,
50 f2 K nikkor 2x, 28-85mm f3.5-4.5 A/I-s, 35-105 3.5-4.5 A/I-s, 200mm f4 Micro A/I, partial list.
"Ain't no half-way" -S.R.V.
"Oh Yeah... Alright" -Paul Simon |
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kds315*
Joined: 12 Mar 2008 Posts: 16625 Location: Weinheim, Germany
Expire: 2021-03-09
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Posted: Sun Feb 14, 2021 3:01 pm Post subject: |
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kds315* wrote:
Looks good to me Toby!
Much better than results I saw from other Old Delft Fototel mirror lenses!
This one uses focusing using the secondary (front) mirror, quite common
with astro mirror lenses.
Lucky find this Wollensak version!! _________________ 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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kymarto
Joined: 30 Nov 2016 Posts: 406 Location: Portland, OR and Milan, Italy
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Posted: Sun Feb 14, 2021 10:19 pm Post subject: |
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kymarto wrote:
I just did a comparison with a 150-500mm f5. 6 Tokina I have, which is actually quite decent, comparable in sharpness in the center to my Nikkor 400mm f5.6 in the center. The Fototel is not quite as sharp, but still not bad. I'll be interested to get home and compare with my old reflex Nikkor 500/5 _________________ Vintage lens aficionado |
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Oldhand
Joined: 01 Apr 2013 Posts: 5999 Location: Mid North Coast NSW - Australia
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Posted: Sun Feb 14, 2021 11:20 pm Post subject: Re: Wollensak Fototel 20 inch f6.3 first test |
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Oldhand wrote:
kymarto wrote: |
This is Wollensak's licensing of the De Oude Delft Fototel mirror lens, introduced in 1953. Mine is is nearly mint condition, and appears to be a prototype or first "edition", because within a year they had changed the external appearance. It seems reasonably sharp, and has pretty good contrast. One interesting thing is that it focuses by moving the front lens/mirror, rather than the whole lens like my Nikkor 500mm/f5. It has a very good MFD, and the image does not fall apart close up as the Nikkor's image does. The orange flower image is MFD, the others close to that. I will try it later at further distances when I have a subject. These are SOOC, metered for highlights, just as ACR thinks they should be, although as posted they exceed safe chroma values.
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Quite nice rendering.
I really like this one and wonder how it would look in monochrome
Tom |
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kymarto
Joined: 30 Nov 2016 Posts: 406 Location: Portland, OR and Milan, Italy
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Posted: Mon Feb 15, 2021 9:53 pm Post subject: |
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kymarto wrote:
Here is a pic of the lens--big and heavy. Interestingly it has a meniscus lens at the rear to adapt to various different flange distances for the cameras for which it was made, instead of simply changing the depth of the adapter like the T adapters.
_________________ Vintage lens aficionado |
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kds315*
Joined: 12 Mar 2008 Posts: 16625 Location: Weinheim, Germany
Expire: 2021-03-09
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Posted: Mon Feb 15, 2021 10:28 pm Post subject: |
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kds315* wrote:
Hmm, interesting but with just one simple meniscus lens, a focal difference cannot be adjusted...it would need some afocal system (?)
That negative meniscus lens usually is used as a field flattener, as without it it would have a convex field of sharpness.
I use another "trick" which they may have used too. Such a mirror lens is very versatile and allows focusing beyond infinity, so if you use a shorter or longer register camera, one simply adjusts using the focus of the lens, the only downside is that the focus distance marks do not fit anymore, but so what...[some mirror lenses have inside a focus adjustment which allows to set the infinity point] _________________ 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
Last edited by kds315* on Mon Feb 15, 2021 10:37 pm; edited 2 times in total |
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kymarto
Joined: 30 Nov 2016 Posts: 406 Location: Portland, OR and Milan, Italy
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Posted: Mon Feb 15, 2021 10:36 pm Post subject: |
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kymarto wrote:
kds315* wrote: |
Hmm, interesting but with just one simple meniscus lens, a focal difference cannot be adjusted...it would need some afocal system (?) |
Maybe it is a part of the optical design, and applies to all the different mounts, but why would a simple negative element not change flange distance? Or are you saying that without at least an achromat doublet it would increase aberrations too much? It is very weak, less than a negative diopter I think. _________________ Vintage lens aficionado |
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