AimishBoy In reply to ??? [2010-11-10 09:38:19 +0000 UTC]
the reason to open the aperture on the 50mm, is to prevent the vignetting, but at the 100mm I usually close it up to F14.. The Dof is about a millimeter as it is, so you want to expend your Dof, on the other hand, don't close it to much because there is a drastic decrease in sharpness with this combination..
I used duct tape at first, but bought this one [link]
coupling rings, they cost about 3$ in E-bay..
just make sure you order the right filter size for your lenses (:
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