Originally posted by jon404 @Doundounba -- Saw your pictures above. Is it safe to put heavy long lenses on the K-01? Bought a 645-K adapter, and my 645-A 150mm on the K-01 is HEAVY! Can the K-01 lens mount handle heavy telephoto Pentax lenses?
Well, I don't have anything *super* heavy... The 35-105mm/F3.5 is about 635g, and the Tamron 80-210 is about 650g. I know the camera feels plenty solid, and it has a metal frame, so I'm not worried. In any case, when I put a heavy/long lens on, I tend to cup the lens with my left hand when shooting (which is needed to focus anyway as my heaviest lenses are MF). Then the camera mount doesn't have to bear the whole weight of the lens. In fact, I do that even with my Sigma 17-70 F2.8-4.5, which does have AF.
That being said, from a balance perspective, I think anything heavier than about 650g is probably more than I would like to have hanging from the front. Nothing to do with the strength of the body though, just a question of "feel" and balance.