Helmut,
I have poured and pondered over the various magnification charts and depth
of field tables till I'm nearly cross-eyed. My arms aren't what they used
to be and it makes my vison blurry <g>.
A 10mm diameter sphere calls for between 2.2 and 2.4 magnification. This is
right on the border of the upper range of a 80mm f/4 on a fully extended
bellows or the beginning of the range of a 38mm on a compressed bellows.
There is a fairly large gap when looking at the 65-116 auto-tube between 2.0
and 2.8.
There are a few ways you can extend or compress these ranges a little more
using extension tubes, for example the 38mm with a 25mm extension tube gets
very close at 2.1, or there abouts.
As for DoF, I could not find a table with the right combination. I would
expect 1-2mm DoF about all one could get, even when fully stopped down.
Such conditions are certainly f/22 and higher territory.
Hope this helps.
John P
Helmut Dersch <der@xxxxxxxxxxxxxxxx> enlightened and delighted with a new
and different form of macro (for me at least) and posed this question:
>With all the talk about insects on this list you might be
>interested to know how it feels to be one yourself:
><http://www.fh-furtwangen.de/~dersch/html/Micros.html>
>
>What would be the best macro-gear for these panoramas?
>I need about 1mm depth of field to get the mirror image
>sharp, but would like to have a somewhat larger magnification
>ratio.
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