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02-20-2013, 05:25 AM   #1
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Takumar repair

I dropped my 135 2.5 lens about 1-2 feet while sitting and now the A/M switch is stuck in open position. Nothing else is damaged as it hit carpet except the switch. I can't find many details on the web about disassembling this lens.

Can someone please point me in the right direction?


03-01-2013, 10:12 AM   #2
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Moved to Pentax SLR Discussion, as this isn't really an article!
03-01-2013, 10:36 AM   #3
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I've been inside from front -- simply focus close, grab front section & unscrew it.

For entering from camera side, check disassemble instructions for 135/3.5 or even 50/1.4 or 55/1.8. The disassemble is similar. Involves "chinese puzzle" moving of aperture ring. Likely, A/M switch is simply bent. Straighten ONCE, i.e. do not stress metal too much or it will break.

Caveat: Is switch really stuck or: On S-M-C Takumars there is a second tiny pin (besides the diaphragm pin) which must be depressed before A/M switch can be switched from Auto to Man.

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