Thanks everyone. ronniemac also makes some good points regarding communication of ideas, so thanks also for those useful thoughts.

The shot was made with the SMC Pentax-DA 18-55mm WR kit lens, so hopefully it also shows that it performs in a satisfactory way! It's also at f/16, so no limitations visually from diffraction either...

Perhaps you could show us an example?

There are two Pentax zooms for the Q. The 5-15mm is already available.

The new 15-45mm zoom should be here soon.

If you want to use DSLR lenses, try eBay, as there are all sorts of adapters for using all sorts of lenses. You will end up with manual focus, but there could be some interesting possibilities.

Hope that helps!

Although Yves is right that our ability to experience colour can be variable, it's not all black and white as arguments go.

For example, if somebody gave us a Cadbury's chocolate wrapper that was printed the wrong colour, we would probably notice that. What we couldn't do is recreate the colour exactly ourselves without a reference.

The eye may have no memory, but if we're being pedantic, the brain has.

The lens of choice is the Pentax 12-24mm f4, which is perfect for architectural shots. Straight lines will remain straight lines.

Interesting but predictable. There are some who always seem to want to see the worst in anything new, even before they have it to see.

The camera should be switched off during lens changing.

There is a memory setting on the camera that decides whether settings are retained or go back to default when the camera is switched off.

The lenses/cameras have been checked and show no problems.

One of the things that I have a concern about is described well by one poster above, that is, the lenses were adjusted and ended up back at zero. We shouldn't expect a lens to need adjustmnent, but the facility is there is needed. If I found all my lenses needed adjustment the camera body would go back.

Equally, with a zoom lens, the adjustment would need to be at a selection of focal lengths, checked using focusing travel in both directions, and an average decided upon. I would need to see some signs of poor focusing to want to do that.

A very wide aperture prime lens is something else, but the eye won't get it right every time either. The amount of error in manual focusing is potentially huge, actually on all lenses.

It's not something I would want to discourage people from doing, but do it knowing why you are doing it, not just because you expect to have to do it. Even the camera manual warns only to do this process if necessary.

I can see a rash of pictures of people with 1970s-style herringbone jackets on its way! The sort that newsreaders used to wear before TV sets could handle the dreadful moire effects.

I'm sure that resolutions are now high enough to make moire a less likely problem even with no AA filter. Hence the appearance of cameras with no AA filter.