>I was wondering what size extension ring you need for 1:1 closeups?
>Thanks, John.
For a 50mm lens, you need 50mm of extension. For a 90mm lens, 90mm
extension. You can get extension by adding tubes and/or winding out the
focussing. The 50mm macro lenses focus out 25mm, giving 1/2 life size. Add a
25mm tube and 1:1 is obtained.
Foxy
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