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Martinorsy
Joined: 07 May 2018 Posts: 11
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Posted: Thu Jan 17, 2019 7:44 pm Post subject: Canon FD S.S.C 200mm f2.8 - missing screws |
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Martinorsy wrote:
Hello everyone!
I am trying to repair Canon FD S.S.C 200mm f2.8, there are missing 2 of the 3 screws for holding the rear.
Is ther any way I can find out which screw type it is so I can buy it somewhere? If that's even possible.
I will be glad for any help,
Thanks!
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marcusBMG
Joined: 07 Dec 2012 Posts: 1304 Location: Conwy N Wales
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Posted: Thu Jan 17, 2019 8:32 pm Post subject: |
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marcusBMG wrote:
Measure them up with an accurate micrometer to get the thread dimensions. These are JIS screws and they are therefore metric. Reference tables will indicate the thread size from the measured diameter. They can be replaced with a countersunk head screw of the same thread size and similar length - likely to be a fairly standard diameter eg 1.8mm, 2mm... so shouldn't be any great difficulty find a supplier. _________________ pentax ME super (retired)
Pentax K3-ii; pentax K-S2; Samsung NX 20; Lumix G1 + adapters;
Adaptall collection (proliferating!) inc 200-500mm 31A, 300mm f2.8, 400mm f4.
Primes: takumar 55mm; smc 28mm, 50mm; kino/komine 28mm f2's, helios 58mm, Tamron Nestar 400mm, novoflex 400mm, Vivitar 135mm close focus, 105mm macro; Jupiter 11A; CZJ 135mm.
A classic zoom or two: VS1 (komine), Kiron Zoomlock... |
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Focusthrow
Joined: 12 Sep 2017 Posts: 209
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Posted: Fri Jan 18, 2019 2:37 am Post subject: Re: Canon FD S.S.C 200mm f2.8 - missing screws |
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Focusthrow wrote:
Martinorsy wrote: |
Hello everyone!
I am trying to repair Canon FD S.S.C 200mm f2.8, there are missing 2 of the 3 screws for holding the rear.
Is ther any way I can find out which screw type it is so I can buy it somewhere? If that's even possible.
I will be glad for any help,
Thanks!
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I no nothing about that lens, but it is highly likely, given the application, that the missing 2 screws would be identical to the one you have in there. Just take that one out and use it to find 2 more. To be sure they work, all you need do is to hand screw them into the threads, making sure they do not bottom out. After you know the length is okay, then you can tighten them with a driver. In other words, they need only be long enough to hold down the plate to which they set up against, but not so short that they risk stripping under any tightening load (torque). Does this make sense? If by some chance they do bottom out (ie, they are too long) simply take a dremel tool and grind off the needed amount so that they screw up flush. The most important thing is the thread pitch--I think it is highly likely all 3 screws have the same thread pitch for that application. JT Best |
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Lightshow
Joined: 04 Nov 2011 Posts: 3669 Location: Calgary
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Posted: Fri Jan 18, 2019 11:19 am Post subject: |
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Lightshow wrote:
Your picture is too small, I can't tell what I'm looking at... _________________ A Manual Focus Junky...
One photographers junk lens is an artists favorite tool.
My lens list
http://www.flickr.com/photos/lightshow-photography/ |
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Martinorsy
Joined: 07 May 2018 Posts: 11
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Posted: Mon Jan 21, 2019 2:49 pm Post subject: Canon FD S.S.C 200mm f2.8 - missing screws |
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Martinorsy wrote:
Thank you everyone for your replies and useful tips! I'll do my best now to put it together. |
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kiddo
Joined: 29 Jun 2018 Posts: 1121
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Posted: Mon Jan 21, 2019 9:35 pm Post subject: |
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kiddo wrote:
My question (probably stupid) would be : shoudn't work any others canon fd (or nfd) to dissasemble the mount and use it's screws? |
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Gardener
Joined: 22 Sep 2013 Posts: 950 Location: USA
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Posted: Tue Jan 22, 2019 4:09 pm Post subject: |
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Gardener wrote:
kiddo wrote: |
My question (probably stupid) would be : shoudn't work any others canon fd (or nfd) to dissasemble the mount and use it's screws? |
The screw in his photo looks longer than a regular FD mount screw. However, it's most certainly not original. |
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