Hi,
Here's proof you _can_ get DOF control out of _any_ lens, except perhaps
the 8/2.8 Fisheye. Did this one for the bokeh TOPE with the 18/3.5 Zuiko
rectilinear stacked on a 7mm Auto Extension Tube.
When putting a lens on an extension tube, it's maximum focusing distance is
so severely limited that backgrounds are easily very heavily rendered out of
focus. This, in a way, then creates what will be perceived as smooth bokeh
(even with the more notorious bad bokeh lenses such as the 50/3.5), simply
because the background is extremely out of focus. I guess one can call this
DOF control, or just limiting the maximum focusing distance severely. Either
way, for getting a heavily blurred background when using a lens which would
normally show a lot of background details (such as wide angles), this trick
seems to work nicely (if and only if your subject allows for getting close
enough).
Actually, the already nice bokeh of the 100/2 gets even more enhanced by
using it on a medium sized (like my Vivitar 13mm) extension tube. I did just
that for taking some pictures of "autumn-red" leaves, and indeed the
terribly ugly background was reduced to a very nice soft green blur, while
the leave itself is tack-sharp, allowing one to count the "veins" of the
leaves.
Regarding the fish-eyes: I would expect this trick also works for those
lenses, but perhaps it doesn't. Did anyone ever try this?
Cheers!
Olafo
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