Kathmandu
Joined: 09 Dec 2009
Posts: 1479
Location: (Kathmandu,Nepal. Currently)Pacific Northwest, USA
Expire: 2012-04-08
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 Posted: Tue Apr 12, 2011 7:12 pm Post subject: Praktina to M42 conversion on an Isco-Göttingen Westanar . |
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Kathmandu wrote:
This conversion was done on an Isco-Göttingen Westanar 180mm f4.5 in Praktina mount.
Original Praktina mount held down by three screws and comes off easily.
Old Praktina mount on left-proposed new insert (aluminum ring thats of the same diameter as the Praktina mount insert) on the right. I drilled three holes in the insert by lining it up to the holes on the lens.
Please note that insert gets wider - the wider part is the part without any holes drilled. I screwed the insert down nice and snug.
I then capped it off with just the outer part of a M42 Tmount adapter. I screwed the TMount down (with the three set screws).I then mounted the lens on my camera via a M42 to Sony adapter.I checked for infinity focus and how the lens lines up on my camera (I like the focus marker up to the center of the camera). I have a little play room on my insert and can slide the T Mount to M42-in and out about 2mm-to adjust for infinity.
Register distance for Praktina is 50mm so that gives us room ,to adapt non destructively in this case.
The key hardware here was the insert-I found mine in an old desk drawer,and it fit perfectly. |
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indianadinos
Joined: 06 Jul 2008
Posts: 1310
Location: Toulouse, France
Expire: 2011-12-05
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| Posted: Tue Apr 12, 2011 8:09 pm Post subject: |
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indianadinos wrote:
| SVP wrote: |
| Neat & clean, nice job! |
Great job, indeed ...
Now let's go hunting for these lenses before it's too late  ...
_________________
Please visit my blogs Shooting with a Pentax K10D / FF Visions
Takumar: 24/3.5, 28/3.5, 35/2, 35/3.5, 50/1.4, 55/1.8, 85/1.8, 105/2.8, 120/2.8, 135/3.5, 150/4, 200/4
Pentax-K: M28/2.8, K28/3.5, M50/1.4, A50/1.7, M50/4 Macro, K85/1.8, K105/2.8, K135/2.5, M200/4, M70-150/4
Zeiss: Flektogon 20/2.8, 20/4, 35/2.4, 35/2.8, Tessar 50/2.8, Pancolar 50/1.8, Biotar 58/2, Sonnar 135/3.5, Sonnar 180/2.8
Meyer: Primagon 35/4.5, Domiplan 50/2.8, Oreston 50/1.8, Primoplan 58/1.9, Trioplan 100/2.8, Orestor 100/2.8, Orestor 135/2.8
Schacht/Steinheil: Travenar 90/2.8, Travenon 135/4.5, Quinar 135/2.8, Quinar 135/3.5
Russian: MIR 37B, Industar 50/3.5, Helios 44M & 44M-2, Jupiter 37A
P6: Flektogon 50/4, Biometar 80/2.8, Orestor 300/4
Nikkor: Nikkor-O 35/2, Micro 55/3.5, Nikkor-S 50/1.4, Nikkor-Q 135/2.8
Fuji: EBC 28/3.5, EBC 55/3.5 Macro, EBC 135/2.5
Misc Lenses: Kiron 105/2.8 Macro, Tamron SP90/2.5
... and a few other Vivitar, Tamron, Sigma and Soligor lenses ...
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