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02-03-2015, 02:44 PM   #1
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Join Date: Feb 2015
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Cosina f/2 50mm stuck wide open

I bagged a really cheap cosina 50mm f/2 lens on ebay for my cosina CT-1A(k mount) however it's stuck wide open and was wondering how I could free it?
thanks in advance

02-03-2015, 03:26 PM   #2
Rimfiredude's Avatar

Join Date: Oct 2014
Location: Washington
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Posts: 2,177
Sounds like oil on the blades.
There are several videos on the web about taking a lens apart.
If you have never had one apart, all I can say is good luck.
02-03-2015, 05:18 PM   #3
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These Cosinas are pretty easy to work on. If you'd like instructions, PM me, an I can walk you through it.
02-13-2015, 05:24 PM   #4
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Original Poster
Managed to figure it out on my own, lens works fine now.


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