The most important thing I learned taking my A50mm 1.4 100% apart for repairs and cleaning was that you don't separate the 2 big helical cut inner and outer parts of the focus assembly without making a solid notch in the metal of both parts indicating which gears mesh with which. The one in mine could go together in like 6 different clock positions and you didn't know if you had it wrong till it was mostly all back together. Plus the gears ends aren't tapered so they are super impossibly hard to get started onto each other even when in the right position. Also make sure you know how to set the fine focus adjustment.
I actually had to file the sides of the smallest flat blade screwdriver I could buy to make it skinnier to get a collar off in addition to needing the JIS screwdrivers.
And take the lens apart over a soft surface like a table with a cloth so crap can't bounce and roll when you drop it. And don't lose the tiny spring for the check ball in the mount assembly.
There are threads on grease selection for lenses, use as thin a layer as possible and work the gears back and forth several times, this will force the extra grease out the ends which you then will want to wipe off. Use the right grease! I picked automotive white lithuim, its a bit thick (super dampened lens now) but it doesn't have oils to separate and it won't get hot and run out since its designed for much higher temp applications.
Umm, actually its amazing my lens works perfectly now considering everything.
Last edited by PPPPPP42; 09-04-2012 at 02:23 PM.
Originally posted by PPPPPP42 
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