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06-16-2012, 02:35 PM   #1
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Canon to Pentax Adapter

Does anyone have experience with FD-PK Lens Adapter Canon FD Lens to Pentax PK Mount Adapter with Optical glass? See FD-PK Lens Adapter Canon FD Lens to Pentax PK Mount Adapter with Optical glass | eBay

06-16-2012, 02:51 PM   #2
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Any optical adapter acts as a short teleconverter, stretching and slowing the lens and impacting image quality somewhat. General consensus is that whatever was special about the lens tends to go away. But if one has a slew of FD lenses and no budget for PK replacements, an optical adapter is better than nothing. Good luck!
06-16-2012, 02:59 PM   #3
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Thanks for the prompt reply and reminding me about the impact of the optical part of this adapter. I just have the chance to buy a lens I like a lot but I will let it pass.
06-16-2012, 03:59 PM   #4
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I bought a pile of FD lenses I couldn't use, sat on them a couple years, and sold them for good profits. FDs are popular now with owners of m4/3 and NEX and Q etc systems, because they can be used easily there. But they're sill rather futile on PK systems.

06-18-2012, 04:10 AM   #5
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I have both the FD-PK and Nikon-PK adaptor. Got them really to play a little with. On the 50/1.8 lenses they are no great performer. Lately I have been thinking of getting a couple of 1.4 x teleconverters and using the bits to make better 1.4 x converters for the long lenses
06-18-2012, 05:27 AM   #6
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I am using it with my FD 85mm F1.2 L





06-18-2012, 06:26 AM   #7
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Thanks for the reply and for the photos. Does the adapter with the element change the f stop? I am thinking of using this with a long telephoto lens and a smaller aperture would make focusing difficult. It looks like the quality is very good.
06-18-2012, 06:45 AM   #8
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The screw you see sticking out is what controls the aperture. The lens will work the same way a M42 lens in M mode acts. The more you stop down the darker the viewfinder gets. Basically you have to focus wide open, then stop down and then hit the green button to meter.

A few samples from the FD 50/1.4

Canon FD 50 1.4 - a set on Flickr

06-18-2012, 06:48 AM   #9
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QuoteOriginally posted by RockvilleBob Quote
Does the adapter with the element change the f stop?
Yes it does. Just like any TC, both focal length and aperture number increase. I'm not sure of the factor; I suspect it's something like 1.25x. I could be corrected here.
06-18-2012, 10:19 AM   #10
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all the camera adapters to PK are differing multiplier factors.

I have the canon and nokon adapters

the canon i measured using my K50/1.4 as a "known" focal length, and a FD 50/1.8 on the adaptor and just assumed that both 50mm lenses were in fact 50mm. the magnification ratio worked ouot to 1.45:1

the nikon adapter was easier to test, I used a tamron 28/2.5 direct with PK mount, and then using the adapter with the Nikon AI mount. worked out to 1.25:1 magnification

there is also I believe a minolta one, but don't know the magnification

each adapter will reduce the working aperture proportional to the magnification
06-18-2012, 10:36 AM   #11
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Thanks to all for your replies.
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