As regards dust, a few specks here and there will soon accumulate. they won't be seen on the image, nor will they affect it. We'd have to see your lens to know if it's too much.

As regards classic lens repairs, I've just had a lens fixed very effectively by Newton Ellis and Co of Liverpool.

www.newtonellis.com

It has a certain logic to it Nigel. However, if we look into the K-5 etc menus then we find the various digital filters and picture styles there, including Landscape and Portrait.

I take your point though.

That would wok well if someone routinely shot at f/8 or f/11 or whatever aperture as the error would be consistent.

Are you sure it's 3 stops to compensate - that's a heck of a lot.

I think it depends what we mean by entry level. At the time lowest cost entry into the Pentax range, but much more advanced than a beginner's DSLR.

It's one of those odd tags that get bandied about that has never really been defined.

Now we are starting to stray, so enough said on that diversion I think.

I think the 10 was the full mount as well. Thanks for the reminder re the various bodies.

Irrational rationalisation, love it! It has to be the best kind.

That's why it's not been a problem yet then. The "crippled" mount came with the first AF bodies I think, when the "A" lenses had been around for some time. It may well have been related to cost, or perhaps to technical issues that were too expensive to solve.

If you can, using A lenses might not cost too much as the prices for your M lenses could be quite good on eBay. Otherwise, it's a problem that just needs working around. In some ways it's easier to use screw thread lenses, which is a bit ironic I suppose.

That wasn't the implication of what I wrote Horst! Those who sell will know how easily a buyer can be put off and what odd little things can suddenly make the difference between no sale and a sale.

I was talking about the vagaries of buyers in general and I should think a large number of sales people will have met them all. Me included.

So which camera bodies did you use? The implication of what you are saying suggests that you might have been using manual focus bodies?

Broadly speaking, I think the mount "crippling" as it's referred to came with the AF bodies.