Archived posting to the Leica Users Group, 2012/04/10

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Subject: [Leica] When a Biogon is no match for THE Biogon
From: tgray at 125px.com (Tim Gray)
Date: Tue, 10 Apr 2012 10:09:33 -0400
References: <CAF8hL-FHOzYfurv9pp1a3+u1f3_39HGYsohp-=vvN=HOdG+Z9w@mail.gmail.com> <CABmfTOXQYh21UQ5kbtt+h_-9F=XFsOV-p7--mfH2c4UMaoHC1g@mail.gmail.com> <20120406141008.GW69877@selenium.125px.com> <CABmfTOW2F2p1H+ASbFgN7+ButbovFGEiqXrtRBq2vWbsQ6=C_w@mail.gmail.com> <20120407145311.GA819@selenium.125px.com> <CABmfTOWWJE4ciDfO+5rNnc0zvVCJA_77akBRyTW6BC1DsYuM8Q@mail.gmail.com>
 
On Apr 08, 2012 at 10:15 AM +0930, Marty Deveney wrote:
>That makes sense.  The wavy distortion will be there if the front
>group is negative, irrespective of the entrance and exit pupils, and
>the distortion charts show this.  I can't find figures for the exit
>pupils of these lenses, but it makes sense to use a symmetrical design
>with a negative front element to move the rear element away from the
>shutter.

I don't have figures for the lenses either.  Just held up the ones I own 
to my eye. :)
In reply to: Message from richard at richardmanphoto.com (Richard Man) ([Leica] When a Biogon is no match for THE Biogon)
Message from benedenia at gmail.com (Marty Deveney) ([Leica] When a Biogon is no match for THE Biogon)
Message from tgray at 125px.com (Tim Gray) ([Leica] When a Biogon is no match for THE Biogon)
Message from benedenia at gmail.com (Marty Deveney) ([Leica] When a Biogon is no match for THE Biogon)
Message from tgray at 125px.com (Tim Gray) ([Leica] When a Biogon is no match for THE Biogon)
Message from benedenia at gmail.com (Marty Deveney) ([Leica] When a Biogon is no match for THE Biogon)