Focomat IIa helicoids - do they fit into a late IIc?

[Guest]

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Hello,

 

the title says it all. Do the focusing helicoids/helicals, whatever the correct term is, those inner tubes that go into the outer tubes on the lens turret of a Focomat IIa (with 5cm/9,5cm lenses) fit the late Focomat IIc? I'm not looking for AF-compatibility here, just the mechanical compatibility of the threads of the tubes.

 

And while we're at it. As I understand the early IIc where shipped with 5/9,5cm lenses as well. Do those helicoids fit the later 90/100mm ones? Again, I'm looking for mechanical compatibility of the inner tubes only - not AF compatibility.

 

Thanks alot

Andi

Edited June 16, 2017 by Guest

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[Guest]

Again, replying to myself answering some things. Thanks to M.Hilo I got hold of some older helicoids that might (or might not) belong to a IIa or an early 2c (with 50/95mm lenses). We're not sure. Those inner tubes are about 2cm shorter than my late IIc helicoids. But, they fit the late IIc 60mm-lens tube. I wasn't able to fit them into the 100mm slot. In theory both are the same, so it should work and maybe it was just my two left hands.

[plus4dbu]

On 7/6/2017 at 8:02 AM, Guest said:

Again, replying to myself answering some things. Thanks to M.Hilo I got hold of some older helicoids that might (or might not) belong to a IIa or an early 2c (with 50/95mm lenses). We're not sure. Those inner tubes are about 2cm shorter than my late IIc helicoids. But, they fit the late IIc 60mm-lens tube. I wasn't able to fit them into the 100mm slot. In theory both are the same, so it should work and maybe it was just my two left hands.

I'm searching for inner helicoids as well and came across this thread.  I have a IIc but missing 95mm inner helicoid. I tried fitting helicoid presumably from an earlier IIa, it does not fit 95mm side but fits 60mm tube.  Any luck finding helicoid for your IIc?