[David H. Bebbington]

David, just off the top of my head, what about extenders?

I have Nikon PK11 and 13 extenders of which the PK13 is meant to extend the 55 Micro Nikkor for 1-1 focusing. By placing the lens further from the body shouldn't the image circle be larger?

Mick.

I'm rather new in the field, Mick, but the optical situation seems to be that the camera lens needs to be at infinity focus. There is no physical object that you can get a bigger image of by moving closer. Also it appears that the lens you use needs to work at full aperture, since stopping down only masks the field of view!

Regards,

David