Rolls on floor laughing.

Oh well - that's me blown out the water then

If r1, r2 and r3 encode the aperture and they are discretes, then only 8 settings would be available. (Grabs camera which currently has 16-50 on - 19 stops between F2.8 and F22 so that doesn't work.) The lens would have to be sending either analogue or serial data which could be done with 2 or three pins, but it seems a bit odd that they should use one of each.

At least one pin will be required for power for the focus motor (assuming it has single voltage for all functions and uses the chassis for return). I would have thought that the autofocus would require at least one pin for position demand as well.

Odd.

It's what I would expect. A prime does not have the compromised optics of a zoom.

Also, the ratio or the size of front lens to the focal length is going to have a bearing on the quality of the picture, because it controls how much light gets in.

The 60-250 is a great lens, but it's never going to compete with other lenses which have such an advantage.

It didn't on my K20d.

The contact missing from the lens may be associated with power zoom.

I tend if I can to use the 50-135. I find I get better results.

I too have just bought one of these, but not had much time to play yet.

Word on the street seems to be they can produce top quality images but have some limitations, and there was a quality control issue.

Another thought - have you found a lens which does work well with your camera? Maybe the camera is at fault.

Either the card slot if you take the card out to put in a reader, or the USB plug if you use the cable to download photos.

All the best Dan.

It's all done on your post count. IIRC, at 30 posts you will become a veteran.