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Old February 11th 11, 03:20 AM posted to
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Default Lens Cell Cleaning

On 2/10/2011 3:47 PM, Cheesehead wrote:

I'm not absolutely certain about the Geronar formula. It is reported
to be a Tessar.

Not sure who told you that but it's not a tessar, it's a triplet. A
modern version of the classic cooke triplet. And a rather good one I
might add.