Archived posting to the Leica Users Group, 1996/06/01

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To: leica-users@mejac.palo-alto.ca.us
Subject: Re: ASPH vs Aspheric
From: "Richard W. Hemingway" <n5xrd@telepath.com>
Date: Sat, 01 Jun 1996 13:54:35 -0500

At 11:38 AM 6/1/96 -0700, you wrote:
>At 12:03 PM 6/1/96 -0500, you wrote:
>
>>I bought a 35mm /f1.4 ASPH and liked it very much until I took some pictures
>>in the mall of a shop that had small christmas lights hung all over it.  I
>>was shocked to  notice triangular flare on the lights near the edges and
>>corners!! I shot it again and same result.  Bought the lens new with
>
>That's coma, and is a common situation with most, if not all, high speed
>wide-angle lenses. Stop down a bit and it goes away. Only bright lights at
>the corner that are so small see to cause this problem with every wide angle
>lens I've ever owned. Just noticed it with my EOS 24mm lens the other day.
>It also happened, to a lesser extent, to my 35 Summilux R.
>
 Hi Eric,

Yes you are correct about the comma, but Lieca made a big point of stating
that the lens didn't have comma, or it was exceedingly small.  They
published some pictures taken in Los Vegas with a lot of lights all over,
edges, corners, etc. as pin points.  My ASPH showed distinct comma, darn
near as much as my f/2.0, which isn't very much, but not touted like the
ASPH. Dick