Auto tubes stay open at all f/stops until you take photo or use DOF.
Manual tubes stop down lens as you change f/stops. Darker image to focus
with, but less expensive.
Manuals were the first ones, auto came later.
Brian P. Huber
> What's the difference between manual and auto extension
> tubes, and what are
> the benefits ???
>
> Cheers, Hefin.
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