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10-28-2014, 11:27 AM   #1
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Pentax 645 lens range

I own a 645 (not 645N, Z, D.. what have you) and I new to the 645 game. I'm really confused about the usage of Pentax K-Mount lenses on it because wikipedia says:

K-mount lenses can be used on all Pentax bodies, but are restricted to stopped down mode when used with "crippled" KAF-mount bodies....

I know the 645 is an A-Mount, but I guess I'm confused by the wiki article.. can I used K-mount lenses on my 645 without an adapter? What wikipedia says about it goes against a lot of articles I've read about people with 645s needing an adapter to to the Pentax 67 lenses.... or gosh maybe I'm just stupid but either way I'm so confused!!!

10-28-2014, 11:33 AM - 1 Like   #2
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You have to go from bigger to smaller. 6x7 is the biggest mount, 645 is smaller, k-mount is smaller still, (and ok the Q-mount is even smaller). With the right adapters, you can mount a bigger mount lens on a smaller mount body, but you can't go the other direction. In other words, a k-mount lens will not mount on a 645 or 6x7 camera.

Also not reading the wiki article, I believe they were really discussing Pentax SLR and DSLR bodies all of which are k-mount. 6x7 and 645 are medium format bodies and are not k-mount.
10-28-2014, 12:05 PM   #3
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Wow, thank you so much for that quick, simple, yet informative answer! I don't know why I couldn't find that answer else, again thank you so much!
10-28-2014, 12:31 PM   #4
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The wikipedia article you're reading is only talking about 135 format Pentax K mount lenses. None of that info will pertain to the Pentax 645.
With the Pentax 645, you can use any Pentax 645 (A, FA, DFA) lens without an adapter, and you can use any Pentax 6x7 lens with the use of the Pentax 645-67 adapter.

10-28-2014, 01:28 PM   #5
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QuoteOriginally posted by turtles5 Quote
Wow, thank you so much for that quick, simple, yet informative answer! I don't know why I couldn't find that answer else, again thank you so much!
You are most welcome.
10-28-2014, 03:23 PM   #6
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QuoteOriginally posted by turtles5 Quote
Wow, thank you so much for that quick, simple, yet informative answer! I don't know why I couldn't find that answer else, again thank you so much!
Here's a complete list of all of Pentax's 645 lenses:

Pentax 645 Medium Format Lenses - Pentax Lens Reviews & Lens Database

You can also adapt these larger 6x7 lenses:

Pentax 67 Medium Format Lenses - Pentax Lens Reviews & Lens Database

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