Hi and welcome

You may have noticed it's not the only Pentax item he has for sale. Looks like all are listed as new, perhaps he's a dealer or is moving bankrupt stock?

Mark, Ignore my pre edit comment. I would hazard a guess that your problem may well be that you need to update to V1.3 firmware. Take a look here http://www.pentax.jp/english/support/digital/k10d_s.html

Changes to V1.30
1. Correspond to PENTAX DA lens which built-in supersonic motor (SDM System)

In other words your DA* 16-50

Hope that helps.

Nah, you really can't compare it with a DSLR IMHO.
I had a Fuji S9500 bridge camera before I got my first DSLR and whilst it was pretty impressive, macro to 300 mm equivalent, nice colours etc. But it just couldn't hold a candle to my E-510 and the set of lenses I eventually purchased. But I guess why should it? ...it was much cheaper

Hi John, welcome to the forum from a new Pentax user

Hi Roger, welcome to the forum

Hi Martin, welcome to the forum.
Apart from the RAW file options I think the menu system is different, the body styling is a little more angular in places. Not sure about anything else, they are very similar. No doubt about it both cameras (K20D & GX-20) are very good value.
I would consider the K20D a step up the ladder from a D90 but then I would say that wouldn't I

Hi there, welcome to the forum.
Sorry to hear about your focussing problem. When you say you get inaccurate results when manually focussing, have you tried using a tripod to do manual verses auto focus? I have done this in the past and used a target like news print taped to a wall. Also use a timer shutter release. I find that it can help determine where the problem lies. Then if you can establish that you have an issue with a lens front or back focussing, you can use a focus chart to enable you to calibrate out the error. I understand that the K10D also has this capability like the K20D.
You may have tried all this already of course.
Best of luck

So your K20D makes this noise too.
I must admit I'm not 100% convinced it's right. My original trade (many years ago) was an instrument maker so small precision mechanical/electrical assemblies are not something completely alien to me
To me it sounds like it is having to overcome some resistance that shouldn't be there, my guess would be a slight misalignment of the motor drive spindle assembly perhaps.

Thanks for the replies. I should have added that it happens with the lens on or off the body, currently I only have the one lens . Yes it seems to be the drive screw / pin mechanism clicking as the lever is turned from manual (retracted) to C and S auto focus (out).

Oh I should also add that this is a new K20D body which I received yesterday, kindly arranged by Chris at SRS because my first one had some issues with many faulty pixels that weren't mapped out by pixel mapping. I do know my original body didn't make this noise.
Am I being picky here? I am concious that to keep returning / replacing bodies is not something SRS or I want to get into. Thoughts?