I currently have an offer to buy on the K20D, subject to payment, but the K10D is still available.

If you want compact and light, then a Pentax KS-1 or KS-2 is as small and light as a DSLR gets, and is as compact and light as many mirrorless cameras. The reason I say this is that the limiting factor tends to be the lens. A huge lens on a tiny mirrorless camera makes it very much the same as a huge lens on a small DSLR, but often more fiddly.

I'd suggest going into a shop and handling the alternatives to see what suits. It can be a very individual choice.

However, the Q series is the really small option and the results can be superb, especially with the larger sensor versions the Q7 and Q S-1.

The resetting issue is most likely a rather silly menu structure. Having set the details, we have to scroll down to "settings complete" and click that tab, otherwise they are not saved.

What makes you think that they are? A few reports on specialised sites of a problem more probably indicates a percentage failure in a batch. Don't forget the thousands of cameras where there has been no fault.

One of the first things to check is that the contacts on lenses and in the camera body are clean and free of grease. Carefully wipe with a soft, dry cotton cloth.

In terms of ergonomics I don't think it makes any difference.

In terms of quality the bigger sensor is better. My Q S-1 gives results identical to my MX-1. Both are superb cameras.

I especially like numbers 7 through to 11.

You get what you pay for, by and large.

Cheap polarisers tend to have colour casts, as well of course as having perhaps a negative impact on sharpness and flare.

This lens is so desirable and so unique, and so out of my price bracket, and I hope you don't regret selling it Mike.

Why not get out there with it and reap the rewards of owning it?

Google translation: there are really many that can work, the thing is to check the amount of voltage it transmits and the specifications it has so as not to damage the device

Please post in English to avoid confusion. Many thanks.