I know there are a few K10D and other Pentax SLR owners on RFF. I don't have one myself but have advised a friend to get one above the equivalent Canon and Nikon offerings.
One of the reasons I pointed him Pentax-wards was the back-compatibility of the lenses. I have a big pile of M42 glass and he's borrowing / buying it as he goes.
Problem is the bleeding adaptors. I'm used to the old EOS-M42 adaptor, which 'clicked' into the bayonet mount (ie you need to press the lens release button to get it back off). This, to me, is perfect; it made my EOS pretend to be a Spotmatic with flash TTL!
But the (cheap-from-eBay) M42-K adaptors are as flimsy as hell and they don't lock onto the body. This means if your lens is even slightly stiff, then focussing unscrews the lens. Twice now have we jammed an adaptor too tightly onto a lens and caused damage.
Is the official (and ver pricey) Pentax adaptor any better? Does it lock into place? Are we both just ham-fisted idiots?
Thanks as always.
DS M3 & RD-1 with 35/1.2 Nokton, J3, rigid 'cron and 90 tele-elmarit --- Canonet QL-17
SPII with 35/2.4, 50/4, 85/1.8, 135/3.5 --- Arax MLU with Arsat 80/2.8 and Sonnar 180/2.8