T3D Re: geometry of a MF macro camera

[erker@xxxxxxxxxxxxxx (Greg Erker)]

>Please somebody shoot some holes in my design before I build one of these
>suckers. :^)  Take a look at http://www.deering.org and let me know!

  A year or two back, Sam and John B had a
discussion about whether MF was any better
for macro than 35mm. I tuned most of it out
(wasn't too interested at the time) but I
seem to recall that there is one issue.

  Lifesize on 35mm means that a 24x36mm
bug will fill the frame. Lifesize in MF
means that you need a 55x55mm bug to fill
the frame. Thus if you want to fill the
MF frame with the original 24x36mm insect
you need to go above lifesize (1.5:1 or 2:1)
to do that, with the resulting problems
from reduced DOF at more magnification.

  So in some ways it depends on the size
of the object you wish to photograph.

  Maybe John B or Sam can refresh us on
what the overall result of the discussion
was.

Greg



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