Pentax-M 2.8 35-70mm aperture repair question

Imaje · 02-18-2019, 04:04 AM

Hello everyone!

I ran into an issue with my recently purchase Pentax-M 35-70 lens.. The aperture would be move correctly and I couldn't adjust my focal length to beyond 50mm.
I eventually managed to take off the lens mount ring ( I may need more screws now ) and noticed this spring seems to have sheered off

Imgur: The magic of the Internet

I am asking can I take the same spring from an existing mechanism from say a Pentax-M 50mm f2 and where would this have to be placed? And also can I Potentially the the screws too?

More pictures of the inside

Imgur: The magic of the Internet

Imgur: The magic of the Internet

Thanks everyone

Not a Number · 02-18-2019, 09:27 AM

If the springs are about the same size and the length of travel about the same - you can probably replace it.

If the screws fit, use them.

Note: Buy yourself a set of JIS drivers and you'll probably never strip a screw head again (threads are a different story).

02-18-2019, 04:04 AM	#1
Imaje New Member Join Date: Dec 2016 Posts: 13	Pentax-M 2.8 35-70mm aperture repair question Hello everyone! I ran into an issue with my recently purchase Pentax-M 35-70 lens.. The aperture would be move correctly and I couldn't adjust my focal length to beyond 50mm. I eventually managed to take off the lens mount ring ( I may need more screws now ) and noticed this spring seems to have sheered off Imgur: The magic of the Internet I am asking can I take the same spring from an existing mechanism from say a Pentax-M 50mm f2 and where would this have to be placed? And also can I Potentially the the screws too? More pictures of the inside Imgur: The magic of the Internet Imgur: The magic of the Internet Thanks everyone

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02-18-2019, 09:27 AM	#2
Not a Number Moderator Join Date: Mar 2012 Location: Venice, CA Posts: 10,526	If the springs are about the same size and the length of travel about the same - you can probably replace it. If the screws fit, use them. Note: Buy yourself a set of JIS drivers and you'll probably never strip a screw head again (threads are a different story).

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