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rakuhito · Joined: 05 Sep 2004 Posts: 4 Location: tokyo

these retaining rings -- someone mentioned they can be hard to find. are they made to specific sizes (i.e. same as the lensboards) or are they specific to each lens? are they available new? what is an average price.

sorry for so many questions. probobly everything will make sense once i get my feet wet.

Rangemaster · Posted: Mon Sep 06, 2004 1:15 pm Post subject:

Each shutter has a specific size lens retaining ring, such as a #0, #1, # 2 and so one, there was some variance between the shutter companies on ring sizes.

I believe if I remember right that Midwest Camera Exchange or S.K. Grimes makes new retaining rings for just about all of the shutters out there.

check with http://www.skgrimes.com

Dave

_________________
Focus on the Picture, Not on the Glass.
Satin Snow(TM) Ground Glass

t.r.sanford · Posted: Mon Sep 06, 2004 3:02 pm Post subject:

Any well-equipped machine shop could made a retaining ring in about ten minutes, if they had the lens to look at and measure. Last time I checked, Equinox claimed to have a large number of retaining rings, but they wouldn't take your word for the diameter and thread pitch; they want you to send in the lens -- and who can blame them?

FWIW, years and years ago there were several devices on the market that looked like large, very sturdy iris diaphragms. They were designed to mount on a lensboard and to tighten down around the rear cell of the lens; they had lock screws to clamp the driving ring when the diameter was correct. This not only prevented your needing to mount every lens on its own board, but also solved your problem if you didn't have the lens retaining flange. I have always thought that was a really good idea.

jsiladi · Joined: 20 Aug 2004 Posts: 34 Location: midwest

Dave.. (others).. The two holes you point out in your modified photo are where screws belong to hold the shutter body together. If I'm not mistaken there should be 4 of them, or at least 3. The silver ring closer to the rear from there is what I thought you were originally talking about but that's the ring that moves the aperature blades. Held on from the inside by 2 other screws..

Jeff

Rangemaster · Posted: Mon Sep 06, 2004 4:58 pm Post subject:

I did clarify that I was mistaken on the mounting holes in the next message, I had to enhance to see it, due to the poor nature of the picture, but I concur, it seems to be the shutter body screws.

Dave

_________________
Focus on the Picture, Not on the Glass.
Satin Snow(TM) Ground Glass

jsiladi · Joined: 20 Aug 2004 Posts: 34 Location: midwest

Yes, You did.. I guess I missed that post earlier.

Jeff

BTW, Check your PM regarding your ground glass (Rangemaster)..

[ This Message was edited by: jsiladi on 2004-09-06 12:38 ]

45PSS · Posted: Tue Sep 07, 2004 5:08 am Post subject:

If just the outer edges of the rear cell are bent then the only problem would be not being able to get the rear cells out to clean them. However if the bend or dent is sufficent to cause the rear element to shift in position then the focus will shift accordingly.

The lens in question has enough bent edge area to be highly questonable. Ask for a picture of the lens sideways from each side (front element to left, front element to right with NO rotation on any other axis.).

Looking carefully at the last picture in the auction, the rear portion of the rim that is in line with the release lever is a long flattened area, that same area the previous photo shows a long flaw along the edge of the glass, it is this section of the rear lens barrel that is believe to be bent worse than the pictures show. The barrel is cone shaped and the mount ring may be hidden from view if there is one and it is the side and rear (thin) area of the rear cone that needs to be checked.

Charles

_________________
While a picture may be worth a thousand words, a quality photograph is worth a million.

[ This Message was edited by: 45PSS on 2004-09-06 22:17 ]

jsiladi · Joined: 20 Aug 2004 Posts: 34 Location: midwest

The original poster did say he was interested in "bad" lenses.. I don't know if it means anything or not but it appears that the front and rear serial numbers don't match (or maybe they do).. I know on Rollei Ziess lenses, they do match.. At least on the tessar lenses, which is the only reason I bring it up.

The Schneider in the auction was obviously taken apart by someone who didn't have a clue. I guess it's also possible that it has been dropped and someone tried to straighten (round) it back out. I'm not an expert with them but any I've ever disassembled, the outer element sat in a lip in the body, then held in by the outer retaining ring. I think if there were a shift it could be readily seen (but maybe not, camera angles can hide some hideous stuff).. You are right though, more photos would definately be a wise request.

Jeff

[ This Message was edited by: jsiladi on 2004-09-07 09:52 ]

Dan Fromm · Joined: 14 May 2001 Posts: 2144 Location: New Jersey

tsgrimm · Joined: 04 Apr 2004 Posts: 158 Location: SE Michigan

There is a 135/235 that easily shows the retaining ring and matching serial numbers.

http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&category=30076&item=3838341334&rd=1&ssPageName=WDVW