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MF lens, make aperture lever shorter

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Raabje View Drop Down
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Post Options Post Options   Quote Raabje Quote  Post ReplyReply Direct Link To This Post Topic: MF lens, make aperture lever shorter
    Posted: 15 June 2020 at 19:21
hello Forum,

I have some MD/MD rokkor lenses I want to use with the Lens Turbo II adapter.

Problem is the aperture lever is a bit too long on some lenses (for example Kiron and Minolta 100 mm Macro, MD Rokkor 50mm f/1.4).

The aperture lever touches the inside metal ring of the adapter, and than the aperture is stuck wide open and doesn't move.

I want to shorten the aperture levers a bit, maybe one or two millimetre.

What is the best method? With a saw for metal, or a file? I have to protect the lens from the little metal parts from sawing/filing. I don't want to ruin the lenses.

thanks, Jeroen
 



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QuietOC View Drop Down
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Post Options Post Options   Quote QuietOC Quote  Post ReplyReply Direct Link To This Post Posted: 15 June 2020 at 19:27
I just ground them a bit on a bench grinder. You could wrap something over the rear glass, but I didn't have an issue with the dust. I used a blower afterwards.
Sony A7III NEX-5T HVL-F45RM LA-EA3 LA-EA4 MB-IV MC-11 EF-E II MD-NEX KR-NEX DA-NEX
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Raabje View Drop Down
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Post Options Post Options   Quote Raabje Quote  Post ReplyReply Direct Link To This Post Posted: 15 June 2020 at 20:29
Thanks for the suggestion! I can get a grinder stone or wheel to use with my drill, to use it as a bench grinder. I will buy a grinder wheel tomorrow at the hardware shop.



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Raabje View Drop Down
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Groupie

Joined: 26 July 2006
Country: Netherlands
Location: Netherlands
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Posts: 50
Post Options Post Options   Quote Raabje Quote  Post ReplyReply Direct Link To This Post Posted: 16 June 2020 at 18:27
job done!

I covered the back of the 50 f/1.4 lens with painter masking tape.

In the beginning nothing happened, but when the metal was hotter (softer?) it was easy with the grinding stone on the drill. No little metal parts, I don't know where they went, it was a clean job.

I will do some more lenses when I have a little bit more time.

Edited by Raabje - 16 June 2020 at 19:19
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