Neither mount nor lens should be dirty and I very, very rarely have ever cleaned the elctronic contacts on either. In fact once only, with a dry microfibre Pntax cloth.

I wouldn't use anything else apart from slight moisture as there is a danger of leaving a film on the contacts. I doubt that a film of WD-40 would be helpful, for example.

This isn't a clasified ad, not in the lenses section anyway. Comments apart from the buy/sell process may be removed from classified ads, as per the guidelines in that section.

Discussion of lenses belongs here.

It seems to be happening, but at a pace that the company can sustain. Growth that is too fast can be a disaster.

There may well be plenty of mirrorless cameras on the market soon, but we'll have to see whether or not they live up to expectations.

Different tools for different jobs Don, so no doubt someone will offer what you are hoping for, but it's a question of how and when.

It may well apperar here yet, but maybe Pentax are trying it out in Japan first?

Nobody removed your image Tony, but you can't replace an image in the competitions. Something else went wrong when you tried to, but it was a computer glitch of some sort that lost your original.

That's very curious as all Pentax AF lenses will work with all Pentax AF cameras, digital or not.

Obviously manual focus lenses will only manually focus, but even then addition of the 1.7x AF converter will enable AF for many of them.

If you're thinking of going digital, then a bit more research might save you a considerable amount of money.

Iso Propyl Alcohol (Iso Propanol) as stated above is safe on audio styli, but beware that it degrades plastics by removing the plasticiser.

So a clean dry cloth is best, very slightly dampened if necessary. The contacts should not be so dirty that anything more is needed.

I think that we've made a more useful set of comments there with a high degree of agreement. It's something worth saying and for beginners in particular to think about.

Much better to understand why we are doing something than to leave the camera always set on green!

I get the WB "wrong" all the time, but quite deliberately so, so maybe it isn't wrong at all.

The concept of WB is to produce a "correct" colour temperature, but I'm in the business of producing images, not scientific white balances. Therefore I'm looking to retain the quality of the ambient light colour, not filter it away with AWB. Sunsets are meant to be red, not grey.

So I use "daylight" predominantly (with exceptions) and revel in the most dramatic lighting I can find. Which is exactly what I did when I used colour slide film - how many of us measured the colour temperature then and applied colour correction filters?

IMHO we become obsessed with some aspects of digital imaging not because it's a good idea, but because we can. Of course, if that's part of an individual's style and fun then it's OK as well.