Archived posting to the Leica Users Group, 1999/07/30

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Subject: RE: [Leica] correction for previous post on lens design
From: "Kotsinadelis, Peter (Peter)" <>
Date: Fri, 30 Jul 1999 14:36:21 -0700

So adding 1 or 2 elements to the original Planar 5-element design still
leaves it a Planar correct?

Peter K

- -----Original Message-----
From: Erwin Puts []
Sent: Friday, July 30, 1999 2:24 PM
Subject: [Leica] correction for previous post on lens design

I wrote:
"On a very broad perspective one can argue that all lenses (except 
the zoom lenses) are all based on one design, the triplet (the Planar 
is a triplet too! 3 lens groups,identical to the Taylor layout)"
Here I was too quick.
The more complete reasoning is this.
There are triplets with a 2-2-1 configuration. Adding one lens in 
front  makes it a 1-2-2-1 version, This is the Planar, which of 
course has four groups. Not three as I noted by a wrong count. It is 
30 degrees C now.Not an excuse of course.