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Good results, One thing to bear in mind, is that the lens would have been stopped down more when not using the extender than when you used it.
Basically by shooting both frames at f5.6, when you didn't use the extender the lens was stopped down one stop. When you added the extender the lens would have been wide open (but with the extender giving you an aperture of 5.6).
So a better comparison might be to shoot an image on f4 with no extender and compare those results.
I think this is correct... what do others think?
Dave.
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