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Message |
    
Steve_feldman
Tinkerer
Username: Steve_feldman
Post Number: 1
Registered: 06-2010
Rating: N/A
Votes: 0 (Vote!) | | Posted on Tuesday, June 22, 2010 - 11:46 pm: | 
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Hi y'all,
I'm sure that someone here knows the answer to this interesting (read: perplexing) shutter problem on my new (to me)Yashica-Mat TLR.
Bulb setting works as it should. Cock shutter, depress and hold release, shutter stays open for as long as the release is depressed. All shutter speeds sound good to my ear - 1 sec to 1/500. Film exposures prove reasonable shutter accuracy.
But here's the rub: I know from owning a few of these beasties in the past that depressing the shutter release immediately opens the shutter, starts the shutter time, then closes the shutter - no matter how long you hold down the shutter release button at any set speed. My Mat will, upon depressing and holding down the release, open the shutter and hold it open for as long as I depress the button. Upon release of the button the shutter timer will activate as set and then close the shutter. At a 1 second set shutter time this is not a big problem. Just let go quickly. At any faster speed it adds up to much longer shutter speeds. f16 at 1/100 second becomes f16 at 1/100 PLUS however long it took me to depress and then release the shutter button - call it 1/8 - 1/4 second - additional exposure. Not good when you wanted 1/100 second only.
Here's the second rub: I can get around the problem by using the self timer. It works perfectly (X sync setting). My procedure is: Advance film, cock shutter, set shutter speed (1-1/500) engage self timer, depress and release shutter button, self timer starts and at the end of the timer the shutter opens and closes per the set speed. A little extra work but effective.
So, does anyone out there in MF land have a fix for this? I know how to open up and clean / lube this shutter. Can't see anything in there that looks bent, broken or loose.
Please send advice and/or pictures. Much appreciated.
~Steve |
Mareklew
Tinkerer
Username: Mareklew
Post Number: 109
Registered: 03-2010
Rating: N/A
Votes: 0 (Vote!) | | Posted on Wednesday, June 23, 2010 - 03:20 am: |
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Have a close look around the "B" lever and its cam. Your description sound like a B pin caught under the cam plate.
Also, a missing spring arund the release mechanics may be the culprit,have a close look there.
Sorry, I'm at work, no pics here ;)
Marek |
Steve_feldman
Tinkerer
Username: Steve_feldman
Post Number: 3
Registered: 06-2010
Rating: N/A
Votes: 0 (Vote!) | | Posted on Wednesday, June 23, 2010 - 11:36 am: |
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Hi Marek,
Here's a digi pix of the shutter. Can you show me?
Thanks.
~Steve |
Mareklew
Tinkerer
Username: Mareklew
Post Number: 112
Registered: 03-2010
Rating: N/A
Votes: 0 (Vote!) | | Posted on Thursday, June 24, 2010 - 01:33 am: |
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The "B" pin is at "10 min to 9 o'clock", it's on the lever fixed with a big headed, black screw (at 10 past 9), both very close to the lens screw mount (center). This lever moves only about 1-2mm. In position as per picture it will result in "B" exposure. When moved away from the lens barrel it should let shutter close instantly. If you try this without faceplate attached you will find the shutter running at ~1s + B in current position, or at 1s with the lever pulled away.
If the shutter runs at "B" even when this lever is away from shutter center, inspect closely that shutter region for missing springs, lose or sticky levers etc.
When attaching faceplate cam make sure the "B" lever rides clean it its groove - you can catch it under the faceplate and even possibly bend the pin down.
Marek |
Mareklew
Tinkerer
Username: Mareklew
Post Number: 113
Registered: 03-2010
Rating: N/A
Votes: 0 (Vote!) | | Posted on Thursday, June 24, 2010 - 01:13 pm: |
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Closeups of good assy:
http://img59.imageshack.us/img59/7686/201003232102555610.jpg
http://img413.imageshack.us/img413/258/201003232102485609.jpg
Here should the "B" pin ride - if you can't see "B" pin in this slot (like in this picture) then that's the reason for your shutter problem:
http://img692.imageshack.us/img692/250/201003222208245604.jpg
Marek |
Mareklew
Tinkerer
Username: Mareklew
Post Number: 114
Registered: 03-2010
Rating: N/A
Votes: 0 (Vote!) | | Posted on Friday, June 25, 2010 - 07:12 am: |
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Have you managed it, Steve?
Marek |
Steve_feldman
Tinkerer
Username: Steve_feldman
Post Number: 4
Registered: 06-2010
Rating: N/A
Votes: 0 (Vote!) | | Posted on Saturday, July 31, 2010 - 10:42 pm: |
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Marek,
I'm going to dive into the shutter again tomorrow. Hopefully I'll see what I've done wrong.
~Steve |
Steve_feldman
Tinkerer
Username: Steve_feldman
Post Number: 5
Registered: 06-2010
Rating: N/A
Votes: 0 (Vote!) | | Posted on Sunday, August 01, 2010 - 03:12 pm: |
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Hi - By following your directions from June 24th I have found the problem - - - and it was me. Yup, I didn't get the bulb pin in the faceplate slot sufficiently. I found that putting the bulb pin where is't supposed to go, placing the faceplate down and then making sure the the slider on the outside of the casing was indeed on the outside, would pop the bulb pin under the faceplate. So I tried it again with more enfasis (sp?) on maintaining the pin in it's slot during the buttoning up sequence.
All is well now. Thanks for your patience with me.
Regard,
~Steve |
Mareklew
Tinkerer
Username: Mareklew
Post Number: 161
Registered: 03-2010
Rating: N/A
Votes: 0 (Vote!) | | Posted on Saturday, August 07, 2010 - 04:54 am: |
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Glad to be of help!
Marek |
Steve_feldman
Tinkerer
Username: Steve_feldman
Post Number: 8
Registered: 06-2010
Rating: N/A
Votes: 0 (Vote!) | | Posted on Sunday, August 08, 2010 - 06:05 pm: |
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BTW - How are you with Mamiya TLR lens cleaning? I've a black model 65mm. Any cleaning advice?
Thanks.
~Steve |
Mareklew
Tinkerer
Username: Mareklew
Post Number: 165
Registered: 03-2010
Rating: N/A
Votes: 0 (Vote!) | | Posted on Tuesday, August 10, 2010 - 01:58 pm: |
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If you mean cleaning optical surfaces then I avoid it as far as I can. They always end up worse than expected in my hands, so my policy is keep them clean, not make them clean and don't fuss as long as you can still count the dust particles.
It seems that all good cleaning stuff is either banned in germany or sold at a dollar per drop...
Sorry, not much help I'm afraid.
Marek |
Steve_feldman
Tinkerer
Username: Steve_feldman
Post Number: 9
Registered: 06-2010
Rating: N/A
Votes: 0 (Vote!) | | Posted on Tuesday, August 10, 2010 - 04:04 pm: |
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Thanks again. |
