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10-10-2013, 11:44 AM   #1
Casey S
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First 645 Pentax......lens adapters.

Hello,

I recently purchased a 645, I keep reading about adapter to use 645 lens on other cameras. I'd like to find info on adapters to allow use of sigma/tamron lens on the 645.

I have various lenses from these manufactures, are there adapters to allow the use of them on the 645?

I'd appreciate any info!

Thanks
Casey

10-10-2013, 11:53 AM   #2
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QuoteOriginally posted by Casey S Quote
Hello,

I recently purchased a 645, I keep reading about adapter to use 645 lens on other cameras. I'd like to find info on adapters to allow use of sigma/tamron lens on the 645.

I have various lenses from these manufactures, are there adapters to allow the use of them on the 645?

I'd appreciate any info!

Thanks
Casey
You can't use K-mount lenses on the 645 because they don't cover the full image circle. You can adapt 6x7 lenses, however, since they cover more.

Adam
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10-10-2013, 02:40 PM   #3
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QuoteOriginally posted by Adam Quote
You can't use K-mount lenses on the 645 because they don't cover the full image circle. You can adapt 6x7 lenses, however, since they cover more.
Not only will K mount lenses not cover the full image area, they won't focus to infinity, because of the lens flange to film/sensor difference. Its much greater for the 645 than for K mount bodies. Be warned, the adaptor for 6x7 lenses to the 645 body is made of "unobtainium," and is quite expensive if/ when you can find it. According to the instructions with the adaptor some 6x7 lenses won't "work" with the 645. I've been looking for long glass, over 200mm, in either mount for my 645 for a loooooong time.
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