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Just wanting to see if I'm missing something here. I've seen a couple of these on ebay:
Pentax 645 to K adapter
At first I thought this would be cool - I could mount my 645 lenses on my K2 or my K100D!
But - why would I want to spend $260 on an adapter (and that seems to be the going price on these) so I can mount my 645 200mm f4 on a K-mount 35mm camera when I've got a 200mm f4 Pentax-A? And why would I want to put a 75mm f2.8 645 lens on my camera when I can get a 85mm f2 Pentax-M lens for almost the same price? It's not like there's a big selection of inexpensive 645 lenses.
Maybe this made sense when you had to buy all of your lenses new instead of for a song on ebay. Or if you were a pro and you were using a 35mm camera as a backup & didn't want to lug extra lenses around.
Just wondering here. I don't see why this would be a good idea right now.