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04-22-2009, 02:20 PM   #1
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Valid PK to EOS adapter - possible?

Hello Everyone,

I wanted a sanity check on my extremely strange idea.

Basically I wanted to ask for opinions regarding is there a way to construct a PK to EOS adapter that could work for Canon 5D? Specifically an adapter that would allow mount unmodified PK lenses, would have the whole lens further away from the mount, and contain at least 1 optical element to compensate for different registration distance.. ?

I mean there are lensed macro extenders out there...

PS. Oh I think i get it, such an adapter would be possible if engineered for 1 specific lens, but not for every given PK lens.

PPS. Or?....

Thanks,
Ilya.

04-22-2009, 03:33 PM   #2
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QuoteOriginally posted by ilya80 Quote
Hello Everyone,

I wanted a sanity check on my extremely strange idea.

Basically I wanted to ask for opinions regarding is there a way to construct a PK to EOS adapter that could work for Canon 5D? Specifically an adapter that would allow mount unmodified PK lenses, would have the whole lens further away from the mount, and contain at least 1 optical element to compensate for different registration distance.. ?

I mean there are lensed macro extenders out there...

PS. Oh I think i get it, such an adapter would be possible if engineered for 1 specific lens, but not for every given PK lens.

PPS. Or?....

Thanks,
Ilya.
Ilya, this seller claims, that the PK lens would work on the 5D:
Pentax PK Lens To Canon EOS EF Mount Adapter 50D 5D 1D - eBay (item 250407441641 end time May-15-09 00:56:18 PDT)

But "work" may just mean, that it is possible to mount the lens, may be the mirror in the 5D shatters, when it then hits the diaphragm lever of the K-lens...

I think an adapter that would be wide enough to clear the offending lever on the K-lenses would be at least 6 or 8mm thick. That is a lot and a lens to correct for infinity focus would be very strong, to accomplish that. That goes hand in hand with increased aberrations and reduced field of view, which is especially troublesome ont eh 5D, which has a reputation for being sensible to vignetting anyway.

So The only option I can see is to use one of the standard PK-to-EOS adapters and remove the lever from the lens.

Ben
08-05-2010, 12:24 AM   #3
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I just bought an adapter but read the fine print. it said I may have to shorten or remove my aperture level. I don't want to render the lens useless to Pentax cameras
08-05-2010, 01:08 AM   #4
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I also have this problem, as I would like to use my 55/1.2 and 200/2.5 on my 5D, and what I plan to do is to craft some remplacement mounts (with M42) for the lenses and exchange them on the lenses : if I want to sell the lenses, I would just have to change the mount

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