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RioRico
Joined: 12 Mar 2010
Posts: 1120
Location: California or Guatemala or somewhere
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 Posted: Thu Aug 26, 2010 4:46 pm Post subject: Petri C.C.Auto 55/1.8 goes UNDER THE KNIFE! |
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RioRico wrote:
While sifting through the lenses I can't use, I came across a Petri C.C.Auto 55/1.8, the kit lens for some Petri SLR's. The aperture is stuck wide open. Except for that, this solid lens appears to be in great shape. It was free, and it is worthless, and I might as well try to convert it to a Pentax K-mount. That should be easy: remove the bayonet, cut away the protruding rim, and screw-down a flanged M42-PK adapter.
BUT... the bayonet is curious. Three lugs, with a screw hole in the middle of each. Flathead screws in two of those; removal is easy. But from the third hole, next to a red-marked index notch, a pin emerges, and that section of the bayonet shows no signs of coming loose. Only two other flathead screws are visible, one on the aperture ring, and one next to the A-M switch, and I am reluctant to remove those now.
Has anyone here disassembled this or any other Petri lens? I have searched for information but can find none. At worst, I could use a Dremel to cut off the bayonet, but I would rather try less drastic measures first. I am open to suggestions.
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Too many film+digi cams+lenses, oh my -- Pentax K20D, K-1000, M42s, more
The simple truth is this: There are no neutral photographs. --F-Stop Fitzgerald |
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Attila
Joined: 24 Feb 2007
Posts: 57849
Location: Hungary
Expire: 2025-11-18
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| Posted: Sun Aug 29, 2010 10:26 pm Post subject: |
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Attila wrote:
Lens butchering are not supported here 
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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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Scheimpflug
Joined: 06 Feb 2010
Posts: 1888
Location: New Zealand / USA
Expire: 2011-11-18
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| Posted: Tue Aug 31, 2010 4:08 am Post subject: |
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Scheimpflug wrote:
Yes, there are certainly plenty of lens mount conversions here, but reversible conversions will always be more accepted.
Is there any way to remove the entire Petri base before attaching your M42-PK adapter, such that the cutting/dremeling is not required, and the lens can be restored to its original Petri mount in the future? 
_________________
Sigma DP1, Nikon D40 (hers  ), Polaroid x530, Pentax P30t, Pentax P50, (P30t/P50 K-A to Nikon F body mount conversion)
Nikon: 18-55/3.5-5.6 "G ED II DX" (F) Soligor: 28/2.8 (FL->F converted), 135/3.5 (F), 3x TC (F, modified) Kalimar: 28-85/3.5 (F)
Vivitar: 70-210/2.8-4.0 Version 3 (F), Tele 500/6.3 Preset (F), 19/3.8 (F) Minolta: 300/5.6 (SR/MC/MD pending F conversion)
Tamron: 28/2.8 (Adaptall) Panagor: 28/2.5 (FD) Aetna: 300/5.6 (F) Osawa: MC 28/2.8 (F)
Vintage Lenses: Dallmeyer: 1940s A.M. 14in 356mm f4 (ULF->M42) 1930s Adon Telephoto Taylor, Taylor & Hobson: 1880s Rapid Rectilinear 8 1/2 x 6 1/2 11.31in f/8 (LF->?)
Parts Lenses: Nikon 35-135/3.5-4.5 (F), Sigma 70-210/4.5 (F), Nikon 50/1.8 Series E (F) |
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RioRico
Joined: 12 Mar 2010
Posts: 1120
Location: California or Guatemala or somewhere
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| Posted: Sun Sep 05, 2010 10:28 pm Post subject: |
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RioRico wrote:
| Attila wrote: |
| Lens butchering are not supported here |
When butchering, I go WHOLE HOG!!  But I probably wouldn't resort to surgery if there were any chance of using that lens otherwise. Even on a Petri camera, the iris still wouldn't close.
| Scheimpflug wrote: |
| Is there any way to remove the entire Petri base before attaching your M42-PK adapter, such that the cutting/dremeling is not required, and the lens can be restored to its original Petri mount in the future? |
Possibly. After a bit of fun HACKING & SLASHING & SLICING & DICING & GLUE-SNIFFING, what I finally did was 1) remove the three screws holding the Petri base cap, and pull that cap, and 2) SuperGlue a cheap Bower-type infinity-focus M42-PK adapter directly to the body base. That glue bond could probably be broken without much trouble, so the base cap *could* be replaced.
Possibly not. As I said, the aperture on this lens didn't function. It's been a few days now so my memory is shot, but I think I unhooked the aperture linkage. Re-attaching the tiny springs could be very tricky. Anyway, I documented the project here (imperfectly).
Don't worry, I won't go out of my way to find more Petri lenses to chop up. Not when I have so many FD-mount lenses to torture and abuse...
_________________
Too many film+digi cams+lenses, oh my -- Pentax K20D, K-1000, M42s, more
The simple truth is this: There are no neutral photographs. --F-Stop Fitzgerald |
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Attila
Joined: 24 Feb 2007
Posts: 57849
Location: Hungary
Expire: 2025-11-18
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| Posted: Sun Sep 05, 2010 11:30 pm Post subject: |
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Attila wrote:
Why you not use of your other lenses and let this lens to go for those people who is looking for it ? I found sometimes very rare lenses like CZJ Tessar 12cm brass SLR lens it was butchered ... decades ago when people believe it has no value. No I saw only this copy under 5 years. Alter a lens just because we can't use it not a right way in my opinion. We have so many other lenses what we can use trouble free. This website is dedicated for preserve old lenses not how can we destroy them, please keep in mind this and respect it!
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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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