@Denis Richard and the responses from some very talented photographers have been fascinating to follow. However, as someone new to DSLR photography, I have a basic question. I read often in related posts about "focal depth" and similar, but how do I determine the optimum distance from coin to camera? I have a Sony a330 with lens SAL 1855. On the lens casing is 3.5-5.6/18-55 SAM and between that and the focusing ring is 18, 24, 28,35 and 55. And a switch for changing between AF and MF. There is a measuring mark on the body of the camera as identified in the manual, but from there how far away should the coin be? (Obviously depends on the subject but I am interested solely regarding coins as the subject). I couldn't find this in the manual or on the Sony website but, admittedly, it might have gone over my head.