Minolta MC Rokkor-PG 50 mm 1.4 - Diaphragm problem

firmyn

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Jun 16, 2018
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Hello !


I recently found interest in photography and even more recently in analog photography. (Find a Nikon FM in perfect situation is quite amazing).


So, I walked down to some garage sales and come back with an old Minolta X-500 and its MC Rokkor-PG 50 mm 1.4 (which is for some people an amazing lens).


The X-500 body has low speed shutter problems but thanks to the old repair forum I managed to fix this.


The main problem is the lens, the piece of metal which allows body to control aperture when firing is "disconnecting" to the rest of the lens (This part, diaphragm blades included are working well).


So to let you get insight on the problem in made videos showing the problematic part of the lens.


First, a general view with aperture ring. As we can see the aperture can move in way it shouldn't but nothing looks broken so it can be wear.
https://www.youtube.com/watch?v=8TtE05q6bTg

Second one, a closer view to the mechanism where we cans see (at 00:57) what's happening when diaphragm won't close.
https://www.youtube.com/watch?v=fupQX3pgYZ8

Last one, an example of fire.
https://www.youtube.com/watch?v=GPQ5KUrrFjo

For me the issue is this piece of metal not doing its job very well, letting the part with the notch going where it wants.

LLRdmpW.png



Thank you in advance for your help ! :)
 
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