想請問在低快門時(約1/15到1),反光鏡不會掉下來的情況!


想請教前輩,
小弟有兩台機械相機Minolta SR-T 303 和Pentax SP 1000,
最近這兩台很奇怪,在低快門時(約1/15到1),按完快門,反光鏡不會掉下來,
都卡在上面,試10次有8次會有這情形!


請問會是什麼原因呢?

我試過這低快門以上的快門,都是正常,B快門也正常!
想說會是天冷的嗎 ?
還是哪裡要上點油?!



感謝!
幫您 google 請參考:

http://www.flickr.com/groups/spotmatic/discuss/72157604399473795/
http://www.kyphoto.com/classics/forum/messages/2/14459.html?1233845641
http://photo.net/classic-cameras-forum/00SjzK
http://www.flickr.com/groups/nikon-fe/discuss/72157617481474530/
http://photo.net/classic-cameras-forum/00UgHB

http://web.archive.org/web/20041217025619/home.pcisys.net/~rlsnpjs/minolta/trouble.html

4. Sticking or Stuck Mirror, The SRT series has a foam stop or cushion at the top if the mirror chamber to lessen the noise produced, and the shock to the delicate mirror when it closes. This foam cushion can become sticky with age and cause the mirror to stay in the up position or delay return. A clue to this condition is foam residue on the forward part of the mirror. Repairing this condition is a simple process of replacing the foam. The foam is available from suppliers and not a difficult repair for the mechanically adept. Believe it or not, SRTs have been taken to the shop with a "stuck mirror" when all that was wrong, was the mirror lock lever was on.



Noise Fans wrote:

想請教前輩,
小弟...(恕刪)


我最近送很台機械相機去清理的經驗 應該是反光鏡活動端乾掉的問題
如果這種問題我都會送清比較快 因為我怕把東西用壞
抱歉 回這種文應該沒幫到您的忙才對
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