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steve_a_reno wrote:
I had no aperture control. I think it just read F_ _ . I.
Your amount of extension/magnification will give you effective aperture control. I am currently experimenting with a 4/3 lens on full frame, using manual tubes. The diaphragm remains fully open but use of tubes and/or TC increase magnification and decrease effective aperture and increase DOF in proportion.
Harold
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