Interesting article on _ Getting a good copy

http://www.dpreview.com/articles/7333489584/variation-facts-and-fallacies

John

Thanks, v interesting.

Thanks for the link - an interesting article I thought; I wasn't surprised by any of the points made but it is nice to see them all laid out in the article. Thank you Pentax for giving a mechanism to offset at least some of this with the ability to adjust autofocus for individual lenses (on the K7 and K5 to my knowledge).

Cheers

......and the K20D-

John

Yes I found this very interesting too.

Yes, nice to see that someone's done some sensible research on the topic.

I doubt it'll stop people posting an uncropped image at 800px wide, and claiming it proves their lens is either sharp or soft though.

It's all a bit too much for me - I just look at my pictures and decide whether or not they look sharp! I was interested in the bit that said a camera will autofocus slightly differently on exactly the same spot if you take it out of focus then refocus again. I have noticed this quite clearly with my K-x and the 55-300mm lens. It's one reason why I tend to use manual focus where practical / possible.

Regards
David