Remount lens from size#1 shutter to barrel mount

[Dr Klaus Schmitt]

Group,

I found a lens which due to defunct aperture needs to be remounted.
http://eblimg.artfact.com/livePhotos/AuctionTeamBreker/15250/998.0.jpg

I would like to put the lens elements (a triplet) into a barrel mount.

Any idea where to find a suitable lens barrel which would accept size#1
threaded elements?

Thanks, Klaus

[mikec]

As this is a vintage piece, I would have expected to see it in a barrel version somewhere on the web. But from the few references I have seen (all refering to your serial no.), your lense is possibly unique prototype! Nice to have. With that in mind I would suggest you get a quote from one of the shutter repair specialists to have the problem fixed rather than find a barrel. It would be a real shame to part the shutter from the glass.

[Arne Croell]

Nice find, Klaus!

The 1st question is, is it really a size 1 shutter following the post-WWII sizes, e.g. what are the front and back thread sizes for the cells as well as the spacing? Some of the prewar lenses used slightly different sizes. As an example, I have a Steinheil Unofocal 13.5cm f/4.5 that looks like it is a size 1, but it isn't - front and rear threads are the same size as one difference.

If it really is a size 1, there should be enough Schneider barrels available from all the people who transferred G-Claron lenses (210, 240 and 305mm used a size 1 barrel) from a barrel into a shutter.

[mikec]

I just stumbled over your thread about this lens on nikongear.com Klaus.
http://nikongear.com/smf/index.php?topic=4628.msg33417

may interest others here.

[Dr Klaus Schmitt]

I just stumbled over your thread about this lens on nikongear.com Klaus.
http://nikongear.com/smf/index.php?topic=4628.msg33417

may interest others here.


Guess you found me!!! Yep, I made some tests using that lens when I found out that one of the blades were crumbled...this is why I try to find a solution here!!

A (macro) UV shot using this lens on a Nikon D70 showing a typical UV pattern, not visible to our human eyes:

http://www.pbase.com/kds315/image/80865496.jpg

and this is the flower in normal white light (same lens):

http://www.pbase.com/kds315/image/80859529.jpg

More of my UV work can be seen here: http://www.pbase.com/kds315/uv_photos; one level up are also lens tests etc.

Cheers, Klaus

[Dr Klaus Schmitt]

Nice find, Klaus!

The 1st question is, is it really a size 1 shutter following the post-WWII sizes, e.g. what are the front and back thread sizes for the cells as well as the spacing? Some of the prewar lenses used slightly different sizes. As an example, I have a Steinheil Unofocal 13.5cm f/4.5 that looks like it is a size 1, but it isn't - front and rear threads are the same size as one difference.

If it really is a size 1, there should be enough Schneider barrels available from all the people who transferred G-Claron lenses (210, 240 and 305mm used a size 1 barrel) from a barrel into a shutter.

Thanks Arne (I was counting on you...),

I took measuerements and indeed the front cell is M40x0.75 and the rear cell is M36x0.75. Unfortunately the threads are very short, so it does not fit modern shutters (had a brand new Prontor #1 here, but the threads start a few milimeters to deep, so the front cell gets no grip). The shutter thread is M39x0.75 - all very standard for a size#1 shutter.

Cheers, klaus

[Dr Klaus Schmitt]

As this is a vintage piece, I would have expected to see it in a barrel version somewhere on the web. But from the few references I have seen (all refering to your serial no.), your lense is possibly unique prototype! Nice to have. With that in mind I would suggest you get a quote from one of the shutter repair specialists to have the problem fixed rather than find a barrel. It would be a real shame to part the shutter from the glass.

Mike,

this makes me think about remounting it (maybe just for a short time to work with it; cf your last entry). I would like to have the shutter restored (or get another IBSOR and exchange the aperture, since the shutter itself seems to fire and work fine) to preserve its value (it came from the Steinheil Museum and was said to be a unique piece).

Do you have info on its age? Where did you get this info from?

Thanks, Klaus

[mikec]

Sorry Klaus, I don't have any more info. My sources were the same auction ads that attracted you. I have tried to find a source of Steinheil and Ibsor production series/dates, but not found any. There must be someone out there with that data.
Arne Croell in this forum may be able to help as in another thread he says
"I have a a book on the history of Steinheil written by the grandson of Rudolf Steinheil (over 450 pages, in German). It lists all or the majority of the prewar and postwar lenses made, but this is not listed. Also, other postwar Steinheil LF lenses I have seen, like a Culminar or a Unofocal all have serial numbers, and the serial nos. list in the book goes up to 1980"

[Arne Croell]

Thanks Arne (I was counting on you...),

I took measuerements and indeed the front cell is M40x0.75 and the rear cell is M36x0.75. Unfortunately the threads are very short, so it does not fit modern shutters (had a brand new Prontor #1 here, but the threads start a few milimeters to deep, so the front cell gets no grip). The shutter thread is M39x0.75 - all very standard for a size#1 shutter.

Cheers, klaus

Klaus,

the short threads are a problem. I checked one of the Schneider G-Clarons in barrel I own, and the threads are also slightly recessed, exactly the same amount as the shutters.
There is a Steinheil serial no. list in Thiele: 150 Jahre deutsche Photooptik. That list dates your lens to 1930.

[Dr Klaus Schmitt]

Klaus,

the short threads are a problem. I checked one of the Schneider G-Clarons in barrel I own, and the threads are also slightly recessed, exactly the same amount as the shutters.
There is a Steinheil serial no. list in Thiele: 150 Jahre deutsche Photooptik. That list dates your lens to 1930.


Thanks Arne, Mike,

I keep forgetting that this book has a list of numbers in it, so it must be made between 1929 and 1930. I really wonder what they used it for these days. I have not yet have the opportunity to test out the image circle, most likely 6x9 I would guess, but then they would have made it around 100mm focal lengths normally. And wide angle? I don't really see that...

So that is bad news about the barrel, I have a 240mm G-Claron more my way from a friend. I also found a Rodenstock Apo Gerogon in barrel mount which has these threads, but the aperture ring is supposed to be kept in place by that front cell, so with mine it is loose and does not work properly. But I also have a Gauthier shutter coming from another friend in the US, so I hopefully have a chance to fix the aperture of the IBSOR shutter (made by Gauthier, as it has the AGC sign on it).

[Arne Croell]

Klaus,

I just checked some more shutters. Synchro-Compurs and older Prontors (SVS) do not have the recess of the threads; modern Compurs do have it. I am not sure what the recess is good for, maybe it is used as guiding to reduce the chance of cross-threading?

[Dr Klaus Schmitt]

Thanks Arne,

guess I have to find one then...

Maybe this was exactly meant for these flat cells with just a few turns?

Cheers, Klaus