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01-01-2014, 02:16 PM   #1
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50 1.4mm focus ring problems

I have a 50 1.4 M that has a focus ring that barely moves. How difficult is it to repair? Is there a You Tube video that anyone knows of that shows how to disassemble it?

01-01-2014, 02:38 PM - 1 Like   #2
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Check out this thread:

Which has the following links
M50 1.4

While these are mainly concerned with cleaning the lens groups dis-assembly of the helicoid usually doesn't involve these steps. Once you remove the trim ring (engraved) there should be another set of screws holding the filter ring on. Removing the ring usually gives you access to the helicoid focus barrel and can be unscrewed at this point.

Make sure you have a set of JIS cross drivers. The JIS screws look like Philips but there is enough of a difference that a Philips screwdriver can strip out the heads.

If you need helicoid grease I've been using this product:

This appears to be of very good quality. You can find it on eBay and will ship internationally.

Last edited by Not a Number; 01-01-2014 at 02:50 PM.
01-01-2014, 02:48 PM   #3
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I will check this out.
Thank You very much!

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