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View Full Version : Can lenses in Sinar DB mount be remounted in copal shutters?



duff photographer
21-Sep-2017, 21:03
Howdo,

I ask the question as I see many second-hand DB mount lenses (principally the Rodenstocks) being advertised at a much lower price than those in copal shutters. Even taking into account locating copal shutters and their cost it still works out cheaper than buying the lens in an original copal.

May I assume that the lower price is due to one or some (or none) of the following?

1. Lack of copal shutters now that they are no longer made (this I doubt).
2. Difficulty of converting the lens to a copal shutter due to some proprietary aspect of the Sinar DB mount specifically made by Rodenstock.
3. Difficulty of any conversion requiring specialised equipment/skill pushing the cost up to the point of not being worth it.
4. Some other aspect I've overlooked.


Many thanks,
Duff

Richard Wasserman
21-Sep-2017, 21:12
I bought a 210mm App Sironar S in a DB mount and put it in a Copal shutter. I simply unscrewed the front and rear lens sections (paying attention to any shims) and screwed them into the Copal shutter, probably took about 2 minutes and it works perfectly. Easy Peasy

Peter De Smidt
21-Sep-2017, 21:14
My experience matches Richards.

plaubel
21-Sep-2017, 23:35
As far as I know, many DB-lenses fit into a Copal shutter because they have been sold in a Copal shutter, too.
I transferred a 75mm Grandagon from DB to Copal.
Ritchie

Bob Salomon
22-Sep-2017, 03:42
All you need is the proper size shutters, a pair of the proper aperture scales and, maybe some shims if the performance of the lens drops in the new mount.

duff photographer
22-Sep-2017, 16:18
Thanks Richard, Peter, Ritchie, and Bob - I very much appreciate your responses. :)

I have access to a stash of copal shutters so I think I shall take advantage of the low cost of DB mounted Rodenstocks and have some fun. Please don't tell anyone as the price may go up on these things now.


Cheers,
Duff

Jody_S
23-Sep-2017, 18:15
I have access to a stash of copal shutters so I think I shall take advantage of the low cost of DB mounted Rodenstocks and have some fun. Please don't tell anyone as the price may go up on these things now.



It's that stash of copal shutters we'd all be interested in, I think.

Steven Tribe
23-Sep-2017, 23:59
+1 to the copal comment!

There is still a very large reserve of the less iconic lenses from the Sinar era.