Don thanks, I have seen how much the Nikon ext tubes are. Wow! I have found some Kenko Ext tubes at about £110.00, and will probably plump for these unless I can find a set cheaper.
Now for the really Thicko question! Draw a circle and do what with it?
Do I photograph it at the largest magnification on my macro lens and then measure that?
Sorry if I am being really dense here! I really am not technically minded.
Nogbad
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