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05-12-2018, 02:55 PM   #1
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SMC PENTAX-M 100mm f4 Macro - Aperture Issue - Please help

Hello,

I need some help. I took apart my lens to clean it and a spring has popped off and now is now not applying proper tension so the aperture will not open all the way when I put it back together. Please see attached. Any help would be greatly appreciated. I need to know how the spring goes. I just purchased this today and messed it up putting it back together

Thank you

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05-13-2018, 01:26 AM   #2
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Location: Smellbourne
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Argh, that's an awful situation.

Does the black pivot arm thing control the aperture? What about the other pivot arm that can be seen on the left in the second picture? Is there a similar spring on the second one?

Also, it looks like there are a couple of silver arms with pins on them, perhaps the spring is meant to hold one of those?

Obviously the above is all just brain farts, because I'm no expert in servicing lens internals (so far I've pulled apart two and successfully reassembled one).
05-15-2018, 05:15 PM   #3
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Original Poster
QuoteOriginally posted by sudo Quote
Argh, that's an awful situation.

Does the black pivot arm thing control the aperture? What about the other pivot arm that can be seen on the left in the second picture? Is there a similar spring on the second one?

Also, it looks like there are a couple of silver arms with pins on them, perhaps the spring is meant to hold one of those?

Obviously the above is all just brain farts, because I'm no expert in servicing lens internals (so far I've pulled apart two and successfully reassembled one).
Appreciate the response. I gave up on fixing it myself and contacted Eric Hendrickson and he thinks he may be able to repair it. It should be arriving to him tomorrow for evaluation. I wish assembly drawings were readily available for this model.
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