Just to clarify, the judge will comment, he's just letting us know that the winner will be chosen imeediately, to keep the schedule going, but the judging will wait till he's back at his computer.

He just doesn't want to try and post his comments using just a Blackberry.

I don't feel annoyed, it doesn't really mean anything, it's just incomplete reporting.

Hence anti-Newton's-rings-glass!

One solution is half glass, just to restrain the natural curvature of the film.

Interesting. I've just looked at the DOF tables in my Pentax book and to be honest they are sometimes quite mysterious at very close distances, where even for prime lenses focal length can change as we focus. Goodness knows what strange effects happen with some zoom designs.

The principles remain the same always, but modern lens making does seem to make a nonsense of them sometimes. I suppose when we put aspherical elements in for a start things will change considerably.

Interesting Philip. I'm not suggesting this isn't valid, but I do have some thoughts about it. I'm wondering about the fact that if correctly focused there should be more DOF behind the focus point than in front. I wonder if some users are tring to make it equal both sides.

The second thought is that checking focus at one distance, one focal length, what aboput all the other distances and focal lengths? If a zoom, of course. Field flatness at close distances will also be a major factor in this.

I'm not sure that it's worth meddling with unless there is a demonstrable problem.

You need to drop a line to PentaxDan to enquire.

I still have the remaining hard copies of the magazine, but I've only kept a small number of each now. Not all copies are available by any means.

Are you an ePHOTOzine member?

Not an easy subject for those of us who are already bored silly by the Olympics, but I'm thinking. Difficult subjects are challenging....

The 60-250mm has a bayonet type hood, so yes it's removable. I presume it will reverse, but I don't store lens hoods like that so I haven't actually tried it. I don't see why not though.

The 60-250mm is quite a big lens, but in fact only measures 167.5mm long, without the hood of course. It shouldn't exceed 300mm, even with the hood.