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[Pigeon_sandwich]

I just received a fairly nice looking Yashica 635 (Yashikor lens) from eBay. I tested all shutter speeds and they seemed fine, although the slower speeds were erratic.
 
Then I tested the 1 sec speed again, and the shutter became stuck open. I ha

[Rick_oleson]

The shutter blades and/or escapement are dirty and sticky.  To clean them, you have to remove the front fascia panel, which in a Yashica unfortunately involves losing the brittle leatherette because it won't survive removal; then you unscrew the fro

[Pigeon_sandwich]

Thanks for the info, Rick. I left the camera in the sun on the seat of my car, while I was at work. When I came back it was warmed up, I jiggled the shutter cocking lever a bit and it clicked shut again! The faster shutter speeds still sound good. S

[Rick_oleson]

Personally, unless you've already got it loaded, I wouldn't waste the cost of film and processing on it right now.  Odds of the focus being off are great, and there's a good chance that the shutter will hang on you again before the roll is fin

[Pigeon_sandwich]

Well, I had it processed. Based on my guessed exposures, the shutter is working well. The fungus in the taking lens had no noticeable effect, despite being a fairly dense, yet small spot.
 
Turns out the taking lens is fairly accurately match

[Rick_oleson]

In most TLRs of this type, the face of the focus knob unscrews, revealing a nut on a threaded shaft inside the knob.  You should be able to loosen this nut, reposition the focus knob and clamp it all down again.

[Late_starter]

Hello,
 
I have been getting used to a Yashica 635 for a little while, having just got back into photography after waiting 35 years.  I love the big negatives, but I decided my camera is over exposing slightly, so I thought of a way to test i

[John_shriver]

Late_starter: I'd expect 1/500 to really be 1/300 on a leaf shutter. The highest shutter speed is often optimistic.  Also, the high shutter speeds are only accurate at wide apertures, otherwise shutter efficiency gives you longer than expected expos

[Late_starter]

John,
Thanks for the advice, but I already started the process using Rick's links for moral support.  The clockworks are modularized, and come out for cleaning easily.  They re-install with a couple of screws and no provision for adjustment is