You compare the result with the correction switched off and then with the correction switched on, using the same lens of course.

IMHO you are over-thinking the situation Stefan.

AP have published their test of the 645D. It's a broadly impressive review, with the remarkable resolution and quality being mentioned with some enthusuasm. The autofocus speed is also very highly rated. It was quite clear that it produces very superior results to the high end DSLRs from Canon and Nikon. It is also true that there are masses of 645 lenses available, plus new digital ones as well in due course.

So, an odd review also in that it starts off very enthusiastically in style and then seems to suddenly throttle back and offer a more tempered conclusion nearer the end. Fortunately if we actually read the content as a whole it shows that the 645D is certainly looking good.

However am I going to afford one?

Not the best lens to bring out the best in the K-r - I had assumed you were shooting with one of the Pentax kit lenses.

Only that they are not portrayed in a derogatory light. Model release forms are not even strictly necessary, but are wise. Any exclusions to use could be negotiated but I have never had to do that.

I would always get a model release form at the time of shooting but as above. Buyers might be wary of simply refuse to accept images without a model release. However, for editorial use I have never been asked for such a form.

The comment about manufacturers deciding to correct lenses in camera rather than in design hasn't really happened yet, but in time it could do. It would be even more clever to push inmdependent manufacturers out by keeping the correction ability strictly for marque lenses only, thus making them cheaper to make and more competitive. However, theres no current evidence that this is the intention. The thing that universally is allowed to drift is the distortion level and the cameras can now help in this respect.

The second point doesn't hold up as there is no apparent deterioration. I have looked, very, very closely and there is no detrimental effect aprt from the processing time. For architecture this will be very useful

Comparing with another lens isn't a valid comparison because it's a different lens.

This would appear to be a total contradiction.

I think there is getting to be much confusion here. If I take photographs with people in them there is no question of the subjects having any copyright over my images.

I'd like to take it if I may.

That's interesting. Given that the 18-250mm is actually a pretty good lens, restricting the range to 18-135mm gives the opportunity for savings in size and weight and also higher performance.

It looks like focusing speed has been tackled as well.

Add WR to the recipe and we have a very attractive proposition.

Pentax I-10, down to £79.99.

You've got it.