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04-21-2010, 08:52 PM   #1
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SMC 50mm f2 disassembly

Disassembly and then reassembly! I have one with some kind of residue on the back side of one of the elements. I have a feeling the lens was either doused or immersed at some point.
I've AI'd Nikkor Autos.

04-21-2010, 09:48 PM   #2
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Although I've had the M-mount version partly apart for a minor repair (the outer filter ring has a habit of coming loose on them) in my opinion that lens isn't worth while dissecting very far for a repair.

If KEH's site was operating I'd tell you how much one in excellent condition was worth through there, however it's down at this time.
04-22-2010, 03:54 AM   #3
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I'd say go for it. Probably you'll end up more dust inside the lens before you started. But it helps alot, and you learn a lot about lenses. I took apart my M 50mm f1.7 because of horrid fungus.

Most difficult part for me was to realize that the "name plate" screws off from front filter threads

I ended up a lens with dust inside but clean of fungus. I also took off the aperture ball bearing to remove klik between apertures.

I'm sorry I know that my post wasn't very helpful

-Juho
04-22-2010, 04:40 AM   #4
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On the contrary. If the front element comes off like the Nikkor (unscrew cone, loosen set screw and unscrew element) I'm familiar with the procedure.
I paid $60 for my other crystal clear 50mm f2 11 years ago from a camera store.
This one came mounted to the MV I just bought off fleabay for $11. and change.

I can't imagine how this lens got like this. Maybe residue from some kind of cleaner that was used in excess. Maybe the vapor got inside and condensed?

I don't think it affects the optics at all, it just annoys the hell out of me, knowing it's in there.

04-22-2010, 07:28 AM   #5
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Based on a lengthy experience with cleaning a relative's old camera gear for sale, I wouldn't be surprised if a previous owner of your lens was a heavy smoker. Cleaning cigarette smoke goo from camera gear is a sure reminder of what happens to a smoker's lungs. It's awful stuff that even stands up pretty well to Windex.
04-22-2010, 10:13 AM   #6
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That's a good point. They did a pretty good job of cleaning the outside of camera and lens though. I should get a pic before I clean it.
04-22-2010, 11:07 AM   #7
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Well that was easy!
The whole group comes out the front without having to mess with the focus gear. I still don't know what that film was but it's gone now!
Another crystal clear 50mm f2!
10-04-2010, 05:47 AM   #8
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Ok. I did the same thing for my 50mm 1.7 with fungus and it came apart the same way and cleaned up nicely.
Now I have an A 50mm 2.0 with what looks like iron filings inside.
It doesn't disassemble the same way.
Can anyone tell me how to take the front group out for cleaning.

10-04-2010, 03:08 PM   #9
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Don't everyone dive in at once!
I figured it out. And I figured out what those flecks were.
The lens is packed with anti seize! WTF!
That's how the focus ring is dampened! Sad!
So the shiny flecks inside the lens was aluminum powder.
Glad I only paid $20 for it.
10-04-2010, 07:08 PM   #10
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You might get more responses if this were posted on the lens forum...
Pentax SLR Lens Discussion - PentaxForums.com




Steve
10-05-2010, 03:48 AM   #11
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Oh yeah...Didn't think of that.
I'ma go check it out!
10-06-2010, 09:54 PM   #12
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i tried to disassemble a Vivitar 28 f2 m42 lens once. it was easy to disassemble, but i wasnt able to put it back together very well. the aperture ring is now loose (does not "click")
10-07-2010, 03:25 AM   #13
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Detent spring.
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