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10-19-2010, 09:12 PM   #1
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Minolta MC/MD to Pentax? YES WE CAN!

Bought an MD to PK adapter from ebay, works with both my MC lenses (MC Rokkor 50mm f/1.4 and Formula5 200mm f/3.5).

I've already written a lengthy thread in ausphotography, with some shots and a link to the seller who was so prompt, the adapter was in the post the same day I ordered and paid. Took 9 days from HK to Aus all up including the weekend.

10-19-2010, 09:32 PM   #2
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The issue most people have about this type of converter is the correction optics used. It slows it down and impacts the IQ.
10-19-2010, 09:37 PM   #3
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I am quite happy with the IQ coming out of the Rokkor, and I suspect issues I have with the Formula 5 are user issues rather than lens issues. Either way, those lenses have been laying about not doing anything since 1994. So I'm happy
10-20-2010, 02:01 AM   #4
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could you post some pictures from the adapted 50/1.4? and how does the adapter affect FOV and speed?

10-20-2010, 04:07 AM   #5
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I have the canon FD -PK and nikon AI-PK adaptors. They are 1.45x and 1.23x respectively

I took shots with my K50F1.4 and the nikon and canon 50mmF1.8 lenses to measure the magnification by comparing how many pixels across a feature in a distant shot was with all 3 lenses when shot from the same spot

I too would be interested to know the magnification of this adaptor
10-20-2010, 11:20 AM   #6
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QuoteOriginally posted by Lowell Goudge Quote
I have the canon FD -PK and nikon AI-PK adaptors. They are 1.45x and 1.23x respectively

I took shots with my K50F1.4 and the nikon and canon 50mmF1.8 lenses to measure the magnification by comparing how many pixels across a feature in a distant shot was with all 3 lenses when shot from the same spot

I too would be interested to know the magnification of this adaptor
Well, the MC Rokkor is the only 50mm I own. How would I measure/compare with "normal". I don't tend to be a pixel peeper, and I have no idea what the adapter's magnification would be. That information wasn't available to me at the time.

Last edited by kyteflyer; 10-20-2010 at 11:30 AM.
10-20-2010, 11:29 AM   #7
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QuoteOriginally posted by axl Quote
could you post some pictures from the adapted 50/1.4? and how does the adapter affect FOV and speed?
I posted some in the post at ausphotography, linked above :P.

As I said to Lowell Goudge, I've no idea how to measure the performance of a lens. All I do is look at the shot and if it seems OK, its all good. I don't even know what people mean by back or front focus... so I am probably not going to be able to answer questions on the more technical aspects of how a lens might perform.
10-20-2010, 02:20 PM   #8
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how about posting a photo of a yardstick/meter stick? where you have only the central 18 inches or 1/2 meter in the frame side to side, with the distance d=from the front element to the subject recodred,

we can then repeat the test at the same distance with a 40mm and measure the length in the frame,

comparing that to your shot will give us the approximate magnification of the adaptor

10-21-2010, 12:42 AM   #9
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QuoteOriginally posted by Lowell Goudge Quote
how about posting a photo of a yardstick/meter stick? where you have only the central 18 inches or 1/2 meter in the frame side to side, with the distance d=from the front element to the subject recodred,

we can then repeat the test at the same distance with a 40mm and measure the length in the frame,

comparing that to your shot will give us the approximate magnification of the adaptor
okay. next job, acquire a yardstick
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