gb hill
Veteran
Did you have to re shim the J-3? I have a J-3 that I need to shim. I posted a thread here and picts. Brian & Kim C. were invaluable help. I need to get at it so I can use the lens on my bessa R. BTW the J-8 looks impressive.
Uwe_Nds
Chief Assistant Driver
No, I didn't have to re-shim. Actually that is one thing I didn't understand in Brian's instructions: there is this ring on the lens module's helix which is held by two screws.
I just took out one screw and losened the other one and turned the ring until focussing was ok.
Best regards,
Uwe
I just took out one screw and losened the other one and turned the ring until focussing was ok.
Best regards,
Uwe
gb hill
Veteran
I guess I should ask if it's LTM or not? I assume it's LTM. The shim is the metal o ring that you see when you unscrew the helix from the body. I need to make a thinner shim than the one thats in place now so the rear element will sit closer to the film plane. I wasn't as lucky as you. My helix was screwed all the way out already.
Uwe_Nds
Chief Assistant Driver
Yes, it is LTM.
Ok, if the helix is screwed all the way, then I understand the need for shims.
Sometimes, even I get lucky... ;-)
Best regards,
Uwe
Ok, if the helix is screwed all the way, then I understand the need for shims.
Sometimes, even I get lucky... ;-)
Best regards,
Uwe
That ring held in by two screws- That is the variable stand-off ring. I'll use it for fine adjustment, but prefer the shim when possible. If you screw the variable ring out far, it can move slightly. You might want to tap new set screw holes to make sure the ring sits properly. If the optics are screwed in all the way to the mount, and there is no shim, you can remove the variable ring and polish it down.
