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J.Scheimpflug

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Since: Apr 12, 2005
Posts: 14



(Msg. 1) Posted: Wed Apr 13, 2005 9:09 pm
Post subject: Planar
Archived from groups: rec>photo>equipment>large-format (more info?)
Just wondering how the Zeiss Planar got its name. Planar is a rather
ordinary word that means Plane. Does this suggest that the lens is best used
as a straight-on lens .. or what?

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brianc19591

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Since: Dec 10, 2004
Posts: 77



(Msg. 2) Posted: Wed Apr 13, 2005 9:10 pm
Post subject: Re: Planar [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)
J.Scheimpflug wrote:
 > Just wondering how the Zeiss Planar got its name. Planar is a rather
 > ordinary word that means Plane. Does this suggest that the lens is
best used
 > as a straight-on lens .. or what?


Flat image field. The double-Gauss design has inherently low field
curvature and astigmatism. This is also true of the wide angle
double-Gauss, otherwise known as the Topogon or Metrogon. By
comparison, triplet and Tessar types suffer zonal astigmatism, and
Plasmats have noticeable field curvature.

Brian
<a style='text-decoration: underline;' href="http://www.caldwellphotographic.com" target="_blank">www.caldwellphotographic.com</a><!-- ~MESSAGE_AFTER~ -->

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