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Forum: Pentax SLR Lens Discussion
12-13-2008, 05:06 PM
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Hi,
I know this threads a little old now but I've had the same problem with my SMC M 50mm f1.7 . Its been away in the cupboard for a bit since I went digital and to Canon.
Anyhow I still love the ME Super and 50mm. I figured I had nothing to loose so I opened it up and was able to clean most of the lens elements.
I opened the lens from the front by carefully turning the ring on the outer edge of the front element. Theres a plastic ring between the element and the filter threads that will screw out too.
If you have a bit of mechanical aptitude it should be pretty easy to open it up and clean the front elements at least. Theres a few tiny screw inside to remove and be careful when to get down to the apperture blades I had them all fall out on me but luckily it wasn't to hard to get them back together.
I'm not to sure what the internal differences are between the A and M models of this lens. The only element the I wasn't able to clean were the interior of rear ones as they are in a group thats kind of joined together with a plastic collar. It has screw collars so it must be openable, mine didn't give with moderate force and I was a bit hestitant to go to hard and break the plastic.
So anyhow if you are going to keep the lens you've probably got nothing to loose. I got rid of the fungus and dust out of mine. And apart from a few specks in the rear elements and a little hazing around the outsides which I'm hoping will be fixed buy leaving it in the sun for a bit its pretty clean.
anyhow good luck
mike
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