Canon LTM Canon 7, film speed doesn't stay put

Canon M39 M39 screw mount bodies/lenses
Chad

Chad

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Hi everyone. I'm new to the forum, although I've been lurking around for a while.

Anyway, on my Canon 7, the film speed that is seen through the shutter speed dial does not seem to be lined up in the window very well. The natural position for each of the film speeds seems to be about half in the window and half out (for any of the settings). 🙄

Any suggestions on a way to fix this?


Thanks.


~Chad
 
Only a guess, but I'd try it and see. There's a fair chance it may work OK, once you've figured out what (intermediate) speed to set it at. OTOH, that old lightmeter may turn out to be a problem ...
 
I think Chad I would forget the built in meter, and use a good handheld one, the cell in the Canon 7 is probably inaccurate now, and on its last legs.
Sadly as there is no accessory shoe on this model you can't use the excellent CV clip on meter.
 
Okay, I'll take a crack at this one. I repaired the meter on a Canon 7 and then calibrated it to be accurate. As I recall, the shutter speed dial comes off the camera and reveals gears down below. I rotaed the gears (or something like that) until the readings were the same as my known accurate Canon 7.

So try it. Compare the readinds with a known good camera. If they agree, use it. If not, post back.
 
Brian Sweeney said:
Okay, I'll take a crack at this one. I repaired the meter on a Canon 7 and then calibrated it to be accurate. As I recall, the shutter speed dial comes off the camera and reveals gears down below. I rotaed the gears (or something like that) until the readings were the same as my known accurate Canon 7.

So try it. Compare the readinds with a known good camera. If they agree, use it. If not, post back.
Click to expand...


Great, thank you.


~Chad
 
There aren't any "stops" for setting the ASA in the 7 or 7s, it's just a friction clutch between that aluminum disk, and the inside of the black shutter speed dial. When you push the ASA change button on the back, a little metal edge pushes up into a rubber disk on the bottom of the ASA disk, and holds it while you turn the shutter speed dial. So just let go of the button when the ASA setting is where you want it, even if that's between the shutter speed clicks. (It won't be between them the next time.)

The shutter speed dial is "interesting" to remove, I'd recommend you leave it in place. There are three set screws, two of which are only accessible at very particular ASA settings. Also, one set-screw is longer, so that you can't turn the ASA dial around and around, else it will get out of sync. (There's a slot in the hollow shaft of the ASA dial that the long set screw rides in.)

Plus, if you remove the dial, you then have to mesh the ASA dial's gear correctly with the dial that turns the f-stop dial above the meter when you put it together.

To check that said gear is correctly meshed, choose a shutter speed and ASA, and say how the f-stop dial is positioned. Other Canon 7 owners here can compare with you.

I only have a Canon 7s, so I can't help with the number combinations.
 
As John said, there's probably nothing wrong with it -- you just need to hold the shutter speed dial between numbers to get the film-speed number in the right place, while you release the lock button to lock it in.

If you've already removed the shutter speed dial and have gotten the dial alignments out of whack, you may want to download a free copy of the original factory repair manual in PDF format from the KY Classics website:

http://www.kyphoto.com/classics/repairmanuals.html

You'll need to follow the onscreen instructions to enter a fake user ID and password; I think they do this to keep web robots out.

The manual should tell you where the dial is supposed to line up at a specific f/stop and film speed combination, so you've got a reference if you need to realign yours.
 
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