Originally posted by Danaher Dempsey The weight of larger heavier medium format lenses could damage the Pentax K camera body.
B&H sells a Mamiya 645 to Pentax K adapter for about $50
B&H sells a Bronica GS-1 PG to Pentax K adapter for about $130
The Bronica adapter includes a tripod foot to better support the heavy PG lenses.
Beware... be careful out there.
---------- Post added 02-05-17 at 03:17 PM ----------
The Mamiya 645 adapter looks pretty interesting if you have either or both of these two lenses.
80mm f1.9
soft focus 145mm f4
Anyone who has shot either of these on a Pentax digital?
What were the results like?
Note: the 80mm f1.9 is not cheap used these days. You would spend about the same as for a new Rokonon 85mm 1.4
The weight of the 645 lenses isn't exceptional and many Pentax lenses are in the same weight-league. So, obviously the usual provisions apply. Don't cary the camera on its neck-strap, with a 500/5.6 Mamiya lens attached... But don't do that either with the Pentax 500/4.5 or a 300/2.8 or a Bigma etc. It's I think, more a question of torque (excerted by longer lenses), than one of absolute weight and some common sense should be applied.
By the way: the soft focus lenses would be about the only reasons to attach medium format lenses to a PK body, as most other focal lengthes are covered by generic Pentax or third party glass.
Ben