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Wernerjb
Tinkerer
Username: Wernerjb
Post Number: 87
Registered: 07-2006
Rating: N/A
Votes: 0 (Vote!) | | Posted on Wednesday, January 31, 2007 - 02:24 pm: | 
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Hi, restoring an SR-T has come to a halt: I need to know what material instead of the deteriorated foam I can use around the viewfinder frame underneath the prism. It has to be black, rather soft and thin. What I usually use as replacement material (thin black felt, cotton strings) for light baffles has turned out to be unsuitabe, W. |
Rick_oleson
Tinkerer
Username: Rick_oleson
Post Number: 165
Registered: 07-2006
Rating: N/A
Votes: 0 (Vote!) | | Posted on Wednesday, January 31, 2007 - 04:24 pm: |
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Edmund Scientific has a flocked black paper with a self adhesive backing. The surface is like velvet, and it's quite a bit thinner than felt. here's a link: http://scientificsonline.com/product.asp?pn=3060068&bhcd2=1170285782 |
Wernerjb
Tinkerer
Username: Wernerjb
Post Number: 90
Registered: 07-2006
Rating: N/A
Votes: 0 (Vote!) | | Posted on Friday, February 02, 2007 - 09:22 am: |
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Thanks for that inspiration, Rick, I found similar material in my parts box: the velvet lining of an old telephoto lens case, it is black, thin and, surprise, surprise, it has a paper backing, that is to say it can be cut with an exacto knife to measure!
The worst thing I discovered about replacing rotten foam strips inside SR-Ts is one most people will never notice it is there; it sits above the mirror bumper, usually preventing a metallic noise when the mirror bumper goes up. The bumper is a piece of sheet metal held in place by a relatively weak V-shaped spring and with an easily replaceable foam strip where the mirror touches it. The other one mentioned prevents the bumper to hit its frame too hard. If it is deteriorated a metallic sound can be heard, that is why old SR-Ts are so loud! In other cases it causes the bumper to stick. Replacing requires the removal of the meter/prism block which is quite demanding. Even with this out of the way it is not easy to glue a new noise absorber where it belongs. |
Wernerjb
Tinkerer
Username: Wernerjb
Post Number: 96
Registered: 07-2006
Rating: N/A
Votes: 0 (Vote!) | | Posted on Friday, February 16, 2007 - 02:27 am: |
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Have taken several steps forward by now in restoring banged-up SR-Ts. At present I have one on my desk with badly corroded CdS cells, maybe because of caustic glue used on mounting them when new. My question now is if anyone before me has ever found corrosion around the meter/prism block, my general impression is that the newer an SR-T (or its standard lens, btw) is the shxttier it is inside, the most recent specimen being real crap. Can anyone confirm this? W. |
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