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04-04-2016, 04:50 AM   #1
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Disassembly help with SMC Pentax-A 645 35mm 1:3.5

Hi, I'm new here, so first hello everyone

I want to disassembly a smc 35mm lens to declick it to use in video, I need to remove the small ball inside the aperture ring to declick it, but I haven't find nothing in web, so I finish here.

I'm from Spain so, sorry about my gramar XD

I'll be very happy if some one could help me.

Thanks in advance and greetings.

04-06-2016, 03:56 AM   #2
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no one?
04-06-2016, 10:52 AM   #3
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I haven't done this but I have replaced the mount on a different lens so maybe they will be similar. I'd try removing the mount plate from the rear of the lens and it might be right there under it.
04-06-2016, 11:25 PM   #4
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QuoteOriginally posted by mattb123 Quote
I haven't done this but I have replaced the mount on a different lens so maybe they will be similar. I'd try removing the mount plate from the rear of the lens and it might be right there under it.
I try that but it doesn't work, I think that must be removing the front elements, but I don't know how to do it :|

04-07-2016, 01:10 AM   #5
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I'm waiting for an -A 35/3.5 to arrive so I'll look at the possibilities once I get hold of it.....maybe I'll see something that you haven't or maybe not.

Bob
04-07-2016, 01:17 AM   #6
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QuoteOriginally posted by Bob L Quote
I'm waiting for an -A 35/3.5 to arrive so I'll look at the possibilities once I get hold of it.....maybe I'll see something that you haven't or maybe not.

Bob
thanks!
04-17-2016, 11:46 PM   #7
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Sorry, I can't see any way to get in there without dismantling the lens further than I want to go on a working item.

Bob
04-18-2016, 12:39 AM   #8
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It is surely not from the front of the lens. I reckon it will be the following procedure.

-remove lens mount
-lift aperture ring (black ring with indicated f-stops) and remove the ball from it.

Pay special attention not to lose the spring that raises the A contact.

Again, I've never dismantled a medium format A-lens, but I have a dozen of 35mm film A-lenses.

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