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luisalegria
Joined: 07 Mar 2008 Posts: 6602 Location: San Francisco, USA
Expire: 2018-01-18
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Posted: Tue Sep 30, 2008 1:29 am Post subject: Homemade lens - 200mm? /f 5.6 ? Former military item ? |
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luisalegria wrote:
I picked this odd thing up a while ago -
It is definitely a homemade M42 mount lens. It bears some strong resemblance in concept to another homemade Exakta-mount lens I picked up a few months ago -
http://forum.mflenses.com/what-the-heck-is-this-thing-200and-f-5-lens-t6488,highlight,penntar.html
The design is substantially different though, as the diaphragm is far from the optics on this one.
The mount is made of various bits, some of which i can identify - there is a series VI filter holder, the diaphragm holder is made from an old Kodak lens hood, and the M42 mount is an M42 reversing ring. I think the helical may be from a movie lens. The lens and lens tube, though, are maybe even more interesting. This is a heavy-duty piece of aluminum with a two-element optic, and under the black paint is a layer of olive-green. I'm guessing this used to be part of a piece of WWII US military optics (telescope, gunsight, surveying instrument ?), adapted as a camera lens, possibly in the late 1950's-early 1960's.
I remounted it on my bellows, as though the focusing mount works and gets to infinity, it is a little stiff and the minimum focus seems to be about 30 ft/10m.
As a lens, it is very interesting. It is quite sharp in the center, but it gets progressively worse towards the edges, with lots of chromatic aberrations and etc. It may not be coated at all, but with just two elements the contrast is just fine. It does flare badly pointing near the sun, but that may be because of some haze on the inner element.
The bird -
crop -
_________________ I like Pentax DSLR's, Exaktas, M42 bodies of all kinds, strange and cheap Japanese lenses, and am dabbling in medium format/Speed Graphic work. |
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casualcollector
Joined: 01 Aug 2008 Posts: 749 Location: Spaced out on Florida's Space Coast
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Posted: Tue Sep 30, 2008 1:36 am Post subject: |
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casualcollector wrote:
Cool! _________________ In Search Of "R" Serial Soligors
Found: 135/2.8 #R407660, 200/4 #R405526, 300/5.5 #R411127 |
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orly_andico
Joined: 02 Jul 2008 Posts: 253 Location: Philippines
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Posted: Tue Sep 30, 2008 4:24 am Post subject: |
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orly_andico wrote:
looks like it came off an M17 Elbow Telescope, which was used to lay 105mm howitzers and the like in World War II. I had one of these as a kid, and the barrel (plus the hole in the barrel..) looks familiar. The objective is around 50mm diameter right? |
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DSG
Joined: 04 Mar 2007 Posts: 544 Location: London, UK.
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Posted: Tue Sep 30, 2008 5:08 am Post subject: |
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DSG wrote:
Again, like your other home-made aquisition, it seems the lens maker was after a sharp lens with good bokeh on a shoestring budget.
I'd love to see a 100% crop of the pigion to see how it compared with a 100% crop from a similar shot from my Sigmatel 135mm f1.8:
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luisalegria
Joined: 07 Mar 2008 Posts: 6602 Location: San Francisco, USA
Expire: 2018-01-18
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Posted: Tue Sep 30, 2008 5:47 am Post subject: |
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luisalegria wrote:
Hi Orly,
I went off to find an M17 elbow telescope of course, and naturally I found one. Isn't the Internet wonderful ?
http://www.usmilitariaforum.com/forums/lofiversion/index.php/t6367.html
It does look like it ! They must have sawed off the tube with the objective lenses.
As for pigeons - this is a bit better focused than the other, but I liked the expression on the one I posted
crop -
Now, these are from a 6MP Pentax K100D, so they aren't likely to match yours. _________________ I like Pentax DSLR's, Exaktas, M42 bodies of all kinds, strange and cheap Japanese lenses, and am dabbling in medium format/Speed Graphic work. |
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Attila
Joined: 24 Feb 2007 Posts: 57865 Location: Hungary
Expire: 2025-11-18
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Posted: Tue Sep 30, 2008 11:02 am Post subject: |
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Attila wrote:
Looks pretty incredible to me !! _________________ -------------------------------
Items on sale on Ebay
Sony NEX-7 Carl Zeiss Planar 85mm f1.4, Minolta MD 35mm f1.8, Konica 135mm f2.5, Minolta MD 50mm f1.2, Minolta MD 250mm f5.6, Carl Zeiss Sonnar 180mm f2.8
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kds315*
Joined: 12 Mar 2008 Posts: 16652 Location: Weinheim, Germany
Expire: 2021-03-09
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Posted: Tue Sep 30, 2008 1:02 pm Post subject: |
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kds315* wrote:
Excellent results - congrats to that find!
I have a (some actually) military lenses made by Ernst Leitz Canada (ELCAN), mostly prototypes and I guess I should give them a try now that I see THAT.... _________________ 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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