|Posted: Tue Jan 16, 2018 11:00 pm Post subject: Help with Zuiko 50mm 1.8 disassembly
|Greetings! Although I have been reading many of the threads for a long time on this forum, this is my first post, so thank you already for all the wisdom and ideas, and of course the photographs!
I hope someone here can help me with this problem:
I have a Zuiko 50mm 1.8 with a sticky aperture. This seems to be the version of the Zuiko 50 1.8 that is prone to the sticky aperture! However, it doesn't seem to be quite the same version that Matt Bierner has the YouTube video for (https://www.youtube.com/watch?v=aj0S55-aXjQ).
I want to be able to clean the diaphragm ring with lighter fluid, but can't do that until the lens elements have all been removed. (I think the aperture stickiness is due to oil between helicoid assembly and the rotating plate that the iris blades sit on, rather than oil on the blades themselves.)
I can remove the front lens group with no problem to get access to the aperture blades (this group seems to be in a single sealed unit), but I can't get the all of the rear group out. I can remove the first black ring on the rear group, and remove the first lens of that group, but then there seems to be a spacer ring that won't budge, and that prevents me from removing the remaining lens element. Does anyone know how to remove this spacer ring, or that entire protruding metal part that contains it?
The olympus.dementix.org/Hardware website seems to be dead, but you can access it using the 'way back machine':
From the PDF, I think my version is on the third page, MS5018 Type-3 (MC), and the parts I'm stuck on are CE101300 and ZC195900, from what I can tell.
It seems as if CE101300 should unscrew (with ZC195900 retained inside it), but I can't budge it. Should I just use more force, or is there a trick to it? Help!!!!
Also, apologies if this seems like a very simple question - this is my first attempt at lens disassembly - I thought the Zuiko 50 1.8 would be a good one to learn on