Originally Posted by
Steve McLevie
Mr Denney,
You're a champ !
I did go back and try again though with the same calculator ...
What I see is that indeed the Xenotar has the thinnest DoF on 4x5. However, as the size of the photo is increased other lenses can achieve the same or less DoF because the Xenotar has a limited image circle.
The Xenar 178mm f3.5 for example, beats the Xenotar with a shallower DoF for the same image on 5x7. The Xenotar in my image size had 28.88cm DoF on 4x5 where the Xenar 178mm has a DoF of 25.04 on 5x7. The Heliar 300mm f4.5 on 8x10 however, beats both with a DoF of 24.4cm at the same magnification.
My conclusion is that the silly prices for Xenotars are not justified. The Xenar on a 5x7 is shallower and not much larger to tote around. The Heliar on an 8x10 is a much bigger beastie though.
:-)
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