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02-03-2011, 11:28 AM   #16
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QuoteOriginally posted by Lowell Goudge Quote
read my last post and that of riorico closelyt

we both have modified lenses from other mounts to K mount. It can be done, the "maching" is not that difficult, and does not require precision.

YOu have 2 options, either find a donor lens or use flanged M42 - K mount adaptors.

the conversions I did were for kiron 24mmF2 and 28mmF2 lenses (one nikon one MD) to pentax.

I opted to go simple and not couple the aperture, making them work like M42 lenses (just easier to mount)

the lenses I converted I got for free due to a problem with Kiron lenses and oil on the aperture blades.
Thanks. Yeah, I see now that you mentioned an MD mount.

02-03-2011, 12:08 PM   #17
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QuoteOriginally posted by clockwork247 Quote
QuoteOriginally posted by RioRico Quote
3) Sell them to someone with an EOS or m4/3 or NEX or NX body.
4) Hang onto them until I get a better idea. Nope, I need money.
I am leaning towards option #3. It's just a matter of when.
a 50mm f/1.4 still fetch a good 50 on ebay... 1/2 the price of a pentax M 1.4.
My MC Rokkors include: 28/2.5; 50/1.7; 100/2.5; 300/4.5. I have some misc others too. One problem: The Rokkors aren't mine. They're an in-law's, and I'm obliged to get to best money for them, and split it. So it's not just, "Hey I don't need these, I might as well sell them". It's more like, "I need to fetch a good amount if I want to stay on good terms with my kin by marriage". See, the human factor DOES impact such decisions!

I'd thought of just buying them for myself. Especially the 28/2.5 and 100/2.5, mmm-mmmm. So I bought a cheap clone for some practice surgery. Failure. I'm just not up to chopping an M/MD mount. Detail: My failure came with the aperture linkage. I got the lens base off, probed around, reassembled it... and it's stuck wide open. Repeated mucking around with the mechanism didn't improve the result. Bother...
02-03-2011, 02:06 PM   #18
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QuoteOriginally posted by RioRico Quote
My MC Rokkors include: 28/2.5; 50/1.7; 100/2.5; 300/4.5. I have some misc others too. One problem: The Rokkors aren't mine. They're an in-law's, and I'm obliged to get to best money for them, and split it. So it's not just, "Hey I don't need these, I might as well sell them". It's more like, "I need to fetch a good amount if I want to stay on good terms with my kin by marriage". See, the human factor DOES impact such decisions!

I'd thought of just buying them for myself. Especially the 28/2.5 and 100/2.5, mmm-mmmm. So I bought a cheap clone for some practice surgery. Failure. I'm just not up to chopping an M/MD mount. Detail: My failure came with the aperture linkage. I got the lens base off, probed around, reassembled it... and it's stuck wide open. Repeated mucking around with the mechanism didn't improve the result. Bother...
i mucked up a 100-500 OM mount... that one hurt, i wanted to do a mount mod... the 1st time opening it was fine, the 2nd time i mucked up the aperture rings, and i tried alot of different things, didn't get it to work. chuck it in the trash .
02-03-2011, 02:24 PM   #19
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QuoteOriginally posted by RioRico Quote
My MC Rokkors include: 28/2.5; 50/1.7; 100/2.5; 300/4.5. I have some misc others too. One problem: The Rokkors aren't mine. They're an in-law's, and I'm obliged to get to best money for them, and split it. So it's not just, "Hey I don't need these, I might as well sell them". It's more like, "I need to fetch a good amount if I want to stay on good terms with my kin by marriage". See, the human factor DOES impact such decisions!

I'd thought of just buying them for myself. Especially the 28/2.5 and 100/2.5, mmm-mmmm. So I bought a cheap clone for some practice surgery. Failure. I'm just not up to chopping an M/MD mount. Detail: My failure came with the aperture linkage. I got the lens base off, probed around, reassembled it... and it's stuck wide open. Repeated mucking around with the mechanism didn't improve the result. Bother...
Maybe you dislodged the spring that holds the aperture mechanism shut.

02-03-2011, 03:42 PM   #20
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QuoteOriginally posted by sewebster Quote
Maybe you dislodged the spring that holds the aperture mechanism shut.
No, it's not that. And I just revisited the lens and found that during reassembly, I'd put the spring-loaded auto-aperture flag on the wrong side of the internal bar it moves. Re-position, re-insert, and VOILA! Now that I know what's what in there, I think I can jam (or glue) that internal bar into position, then replace the thick mount with a thick m39-PK adapter, maybe with a 2mm-thick washer so it won't focus too far past infinity.

I look at the Rokkor 100/2.5 and think that I could *maybe* do a similar lens base replacement. But I'm hesitant to fock-up a not-cheap lens that doesn't belong to me (but will if I fock it up!) so I guess I need some trashed Rokkor for more trial surgery. Volunteers well be gratefully accepted.

Last edited by RioRico; 02-03-2011 at 03:57 PM.
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