John;
Rule of thumb: Length of tube for 1:1 = half the focal length of the
lens, if the lens goes to 1:2 by itself. Eg for the 50 macros, 25 tube
does it. For the 90, 45 mm tube needed. (or 25+14+7)
george
John Gaasland wrote:
> I was wondering what size extension ring you need for 1:1 closeups?
> Thanks, John.
>
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