cyberjunkie
20-Jan-2011, 04:11
Hi!
Time ago i acquired a Protarlinse Series VII set (35cm + 29cm) fitted on a nice Compur No.2 shutter with two professionally made aluminium adapters.
Unfortunately i need that shutter for another use, and i am too broke to buy another one :-(
It's a Compur No.2 5/II, and it would nicely fit a 305mm G-Claron (first version, Dagor-like). I needed the same shutter for another orphaned lens, and i had to buy a convertible Symmar 240mm to get it! I had to shell out 151 euros for it, plus shipping, and i am left with two Symmar cells with no use, and very very little value. A real shame!
I tried to find some pictures of my Protars on the web, to see what was the original shutter used at the time.
Here is an example:
http://www.kevincameras.com/gallery/v/zeiss_misc/protar/album6591/
It's a dial-set Compur, looking bigger than a No.1.
So i went to my bargain shutters box, acquired over time, for as cheap as possible.
I found a black dial-set Compur, with the C.P. Goerz mark on it (probably the US company, cause it came from there).
I found a strange thing: the threads are perfectly OK, nevertheless the shutter is not compatible.
The back thread could be OK, but it's too recessed , so the cell gets screwed all the way with just one and a half turns. It should be enough to retain the cell, so i won't complain.
The front thread, on the other hand, is too short. Instead of threading the front attachment all the way down, it was threaded for one cm. or so, and below there is a restriction. The 35cm cell protrudes at the back, so it gets against the restriction before it gets ingrained in the thread.
I had the naive idea that old dial-set shutters were more or less standard, but now i understand that the sad reality is that spacing (the length of threads) was different from one example to another. Finding a shutter with the right threads diameter is not everything, you must be lucky enough to find a shutter that was made for similar cells.
Machining the front thread all the way down would leave a spacing about 1mm too short, so the front cell should be shimmed. I guess that the shutter should be better disassembled, to avoid metal shreds from entering the shutter innards.
All in all, not exactly cheap.
So i am asking here.
Maybe somebody has a much better knowledge about old dial-set Compurs.
Maybe the example i own is just ann odd version made under Goerz specs.
Maybe most of the similar shutters would work with the Protars with no modifications at all.
Who knows... :D
For sure, finding another example in working order would be cheaper and quicker than
having the work done on my shutter. Still looking for a cheap, fast and capable lathe artist... but no luck so far :(
Any advice?
have fun
CJ
Time ago i acquired a Protarlinse Series VII set (35cm + 29cm) fitted on a nice Compur No.2 shutter with two professionally made aluminium adapters.
Unfortunately i need that shutter for another use, and i am too broke to buy another one :-(
It's a Compur No.2 5/II, and it would nicely fit a 305mm G-Claron (first version, Dagor-like). I needed the same shutter for another orphaned lens, and i had to buy a convertible Symmar 240mm to get it! I had to shell out 151 euros for it, plus shipping, and i am left with two Symmar cells with no use, and very very little value. A real shame!
I tried to find some pictures of my Protars on the web, to see what was the original shutter used at the time.
Here is an example:
http://www.kevincameras.com/gallery/v/zeiss_misc/protar/album6591/
It's a dial-set Compur, looking bigger than a No.1.
So i went to my bargain shutters box, acquired over time, for as cheap as possible.
I found a black dial-set Compur, with the C.P. Goerz mark on it (probably the US company, cause it came from there).
I found a strange thing: the threads are perfectly OK, nevertheless the shutter is not compatible.
The back thread could be OK, but it's too recessed , so the cell gets screwed all the way with just one and a half turns. It should be enough to retain the cell, so i won't complain.
The front thread, on the other hand, is too short. Instead of threading the front attachment all the way down, it was threaded for one cm. or so, and below there is a restriction. The 35cm cell protrudes at the back, so it gets against the restriction before it gets ingrained in the thread.
I had the naive idea that old dial-set shutters were more or less standard, but now i understand that the sad reality is that spacing (the length of threads) was different from one example to another. Finding a shutter with the right threads diameter is not everything, you must be lucky enough to find a shutter that was made for similar cells.
Machining the front thread all the way down would leave a spacing about 1mm too short, so the front cell should be shimmed. I guess that the shutter should be better disassembled, to avoid metal shreds from entering the shutter innards.
All in all, not exactly cheap.
So i am asking here.
Maybe somebody has a much better knowledge about old dial-set Compurs.
Maybe the example i own is just ann odd version made under Goerz specs.
Maybe most of the similar shutters would work with the Protars with no modifications at all.
Who knows... :D
For sure, finding another example in working order would be cheaper and quicker than
having the work done on my shutter. Still looking for a cheap, fast and capable lathe artist... but no luck so far :(
Any advice?
have fun
CJ