I think you'll find that the exposure compensation required will be the same
for the same magnification regardless of the means to achieve it.
...Wayne
> On the other hand the autotube with CU lens looses almost no light where
> one loses another stop going from 1:1 to 2:1 on a bellows with that lens
and it
> is less fussy using the autotube than using a bellows. On the other other
> hand, 2:1 mag is always fussy and requires good technique.
>
> Not enough hands, Mike
> --
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