Yashica Copal shutter question

[aadewar]

Hello,

 

I recently bought a Yashica 635 TLR, and I've noticed something about the shutter-

 

If I fire the shutter at a low speed, say 1/25, and then move it up to 1/250 or 1/500, the

speed seems slow until the shutter is then fired at least once at 1/500. I can figure out

some work-arounds, but is there anything I'm missing?

 

Other than that, it seems OK, and is a lot of fun to use. I shot a roll of Velvia yesterday,

likely try some print film today so I'll know how serious the whole affair is soon enough.

Thanks,

 

Aaron

[jack_fisher1]

The shutter needs a Clean, Lube, Adjust (CLA). The speeds timer is sticking.

 

JF

[john_shriver]

While I don't know this particular shutter, there generally are one or more cams on the shutter speed dial, and spring-loaded arms that follow those cams. Those arms setup how long the delay gears whir, etc. One of them is clearly gunked up enough that the springs are not enough to make it move to the right position as the shutter speed requires.

 

Cleaning and lubrication are needed.

[aadewar]

Thanks-in further confirmation of your diagnoses, I took it out in the cold today, and I

think all my shots are going to be overexposed by the sound of things.