At least we have a straight answer, we can deal with that.

Politics and sport are two areas that have no interest whatsoever for me.

Ah, that would explain why you've kept asking the question!

I think I've answered it now as above, but if that needs any clarification please let me know.

Pentax and Marc Newson may well have been on to something. You try and buy one now at a reasonable price, all the new or mint ones I can find are very highly priced.

That's not what I told you Marat, and I did give you a reply via PM, after which you're still asking the question.

Pentax users should have no problem posting Pentax pictures, users of other marques need to stay marque-neutral. It's simple when we don't try to over-define it, but then most things are!

Thank you John, that's a concise summary. It's a matter of common sense really.

For Marat, you seem to be a Sony user, the use of Pentax lenses might be incidental to that. I have no idea what the prospects are for finding a like-minded Sony forum, although I guess both ePHOTOzine and AP both have areas dedicated to that.

That seems pretty clear to me, notwithstanding the spelling errors!

Pentax images only please, but obviously you can use Sigma or other lenses.

Using Pentax lenses on a Canon or something else would need to be in context of a Pentax related discussion, and linked to rather than posted directly.

I post my non-Pentax images elsewhere, wherever they may be directly of interest. I particularly like the wide variety of Facebook groups that cater for almost anything we could imagine.

Nice images Steve, probably, but I do find them very hard to view because of the very dominant watermark.

They make the point though.

Make sure it's a rocket blower and give it a few test puffs before you start, to clear any dust out. Hold the camera facing down as you puff, and any dust will fall out rather than in. Don't touch the sensor.

Try a few good puffs before using the dust removal system in the camera several times if necessary.

That has never failed to clean a sensor for me.

The SDM problem seemed to be restricted to early samples, so we should be way, way past that by now.

It's the 100-400mm I'm concerned about. It needs to arrive when I can afford it, as I know I need it even before we know specifically what its spec is.