Disassemble Vivitar 28 f2.8 Close Focus

[giornata]

I've got a Vivitar 28mm f2.8 Close Focus lens on approval. The glass elements seem fine, but it's in bad condition mechanically. It's very graunchy when turning both the focus and aperture rings, and the focus ring seems seized in some funny way. When you turn it, the part of the lens barrel that has the DOF scale turns with it.

So, it needs disassembling, cleaning, and lubricating. My question is, will that be relatively straightforward? I'm reasonable handy, but no watchmaker. As it's a prime I'm thinking it won't be too bad.

[ovim]

I don't know if this helps but here's a thread of mine on Pentaxforums.com about Close Focus 2/28mm which I converted from one mount to another.

At least on the f2 variant you can get to the focusing helicoid and aperture ring by starting from the front.

[kuuan]

maybe this helps: http://elliotkang.wordpress.com/2012/05/13/disassembly-of-vivitar-28mm-f2-8/

[Layer-cake]

most prime lenses follow a very similar design to their construction, cleaned a tokina 28mm 2.8 and that was my first and easiest lens to clean.

what I would suggest is take photos of every step to make it easier when putting it back together, one important step is when you separate the helicoids from one another mark off the exact point they separate or you're gonna have a fun couple of hours trying to figure out that point and it's a crucial thing for most lenses to work correctly.

If you get stuck anywhere post on here and I'm sure someone will be able to help.