Schneider SA 90 f8 coated(not MC) compur

[Rustler84]

I recently bought this lens from a local guy. He said the shutter was sticky on the slow speeds. I had the lens apart and big surprise... The slow speed governor is missing. I got it for a decent price so no biggie.

From what I can tell the shutter is most likely a CN-1251-010 Compur 0 MXV with blade opening mechanism according to the only original literature out there. This lit looks like its years before my lens was made though. My lenses serial places manufacture in 1976.

one more tricky point is that according to schneiders page this lenses shutter could be a 0+1. What the heck is that? Google doesn't like that search

I am plenty competent with tiny mechanical devises so thats not a discussion point. So there are three options I am looking at.
1. Find a governor and instal(easy if findable)
2. Attempt to retrofit a copal 0(potentially the most annoying option but most rewarding)
3. Leave it be and make the lens a B 1/15s-1/500s(lazy but no fun)


Thanks for your help!

 

[shutterfinger]

The delay timing is there, its the self timer that's gone.
Edit: The basic shutter is CN-1110-000, the delay timer is tafel 5 and the self timer is tafel 6.
Do not disassemble the delay timer unless absolutely necessary. Flushing it with cleaner is all that is normally necessary but on rare occasion a full disassembly is needed to clean the gear shafts and their pivot holes. On reassembly the initial tension of the coiled torsion spring, item 314, is critical. 1 gear tooth makes the difference between all speeds in tolerance or just some. Pressing 341 in allows the mechanism to run and 305 will disengage from 314 requiring it to be retinsioned. Correct tension is the outer most coil equal to the thickness of the spring material either side of the outer edge of the gear, position depends on shutter wear.

 

[Rustler84]

Thank you. I wasn't expecting such an in-depth reply but I will take the advise gladly. And although I like a challenge I draw the line well before disassembling the timers.

 

[shutterfinger]

I have an older version Compur 0 parts shutter but I don't think its self timer will work in yours.
I've never seen a delay mechanism colored like yours. It may be from chemicals or heat.
Production changes were made without changing the service manual base shutter diagram and shutters of the same vintage have part differences between makes of cameras they were used in.
A large format shutter within a few hundred of the serial number of your shutter will likely have interchangeable parts where as a 1000 or more difference in serial numbers may not.

A synchro compur for a 210 symmar.

The speed delay controls all speeds from 1 second to 1/125 second, B (bulb) and T (time) are done with lockout levers, while faster speeds are the main cocking and booster spring controlled.

 

[Rustler84]

Just looking at the guts of yours, I highly doubt it as well. The self-timer is completely missing. That discolouration is actually the underlaying plate. I am going to be in Edmonton, AB and theres a store there that might have it or know how to get it quick.

And I flubbed the part number I thought it was..... **CN-1210-051** So Im guessing because there is a limited diagram for the 1210-051 its an addendum to the base diagram 1110-000.

 

[shutterfinger]

No, that's not the parts shutter I posted the picture of.
The CN-1110-000 is a 00 shutter. The CN- 1210-051 is the same core shutter only larger with different control levers and a case ring. Parts layout and assembly order are the same. Use the CN-1110-000 for the core teardown/buildup then CN-1210-051 for the final assembly of the control ring and levers.

 

[Rustler84]

ok. that makes sense. So if I'm hearing you right its kinda hopeless to get the correct part. even if its an internal part.

 

[shutterfinger]

So if I'm hearing you right its kinda hopeless to get the correct part. even if its an internal part.

No, just difficult.
Provide a straight into the shutter picture with the cover removed and the shutter serial number.

 

[Rustler84]

Im not to sure if thats the serial. and which way to read it.

 

[shutterfinger]

The Synchro Compur/Compur shutters that I have parts will not work in yours. The self timer is set by mechanical lever and engaged by the cocking ring preventing it from returning to the released position for the delay time.
The one for your shutter may set by mechanical lever but it blocks the speed timing from operating for the delay time by blocking it at the lower arm of the speed delay timing mechanism.
Its been a few years since I've worked on one of this type.

 

[lobitar]

I recently bought this lens from a local guy. He said the shutter was sticky on the slow speeds. I had the lens apart and big surprise... The slow speed governor is missing. I got it for a decent price so no biggie.

From what I can tell the shutter is most likely a CN-1251-010 Compur 0 MXV with blade opening mechanism according to the only original literature out there. This lit looks like its years before my lens was made though. My lenses serial places manufacture in 1976.

one more tricky point is that according to schneiders page this lenses shutter could be a 0+1. What the heck is that? Google doesn't like that search

I am plenty competent with tiny mechanical devises so thats not a discussion point. So there are three options I am looking at.
1. Find a governor and instal(easy if findable)
2. Attempt to retrofit a copal 0(potentially the most annoying option but most rewarding)
3. Leave it be and make the lens a B 1/15s-1/500s(lazy but no fun)


Thanks for your help! View attachment 211995 View attachment 211993 View attachment 211996

The 0+1 shutter size conundrum refers to modern times when german manufacturers began to decrease the number of shutter sizes. I believe Prontor Professional shutters led the way. It's simply a no. 1 shutter with adapter insert to make it fit lenses thats designed to fit no. 0 shutters.