Originally posted by clackers Okay, we have our answer then - not your camera.
Your DA*300 would need its AF motor replaced.
But the DA* 50-135 has its backup method ... and the lens is so good I even used it last weekend on my K-1 in crop mode (see below). It was intermittently not working for the guy I bought it off a couple of years ago, so I relieved him of it, and converted it in about fifteen minutes.
Well, while the DA*300 hasn't been used a whole lot and while it is a very fine optic.... I'm not paying Ricoh to fix their "F" up. The focusing mechanisms in the DA* lenses appears to be a great teaching aid in Engineering college's of how not to design an electromechanical focusing mechanism. I "may" get the DA*50-135 converted as its so reasonable cost wise and because there isn't any other quality crop sensor zoom in that focal range available to replace it. If the DA*300 craps out it goes to the dump and I'll save up and buy the lens I really wanted, the Sigma 300 f2.8 which is both optically great and always focuses.
Having said all of that, I really like all of my Pentax gear especially the FA lenses along with my DA*16-50 which is a great lens and so far has worked/focused every time but one out of three lenses working isn't enough justification to invest any more money into DA* lenses..
Great photo by the way. Shows how good the DA*50-135 glass really is...
Bob