Archived posting to the Leica Users Group, 2001/05/18

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Subject: Re: [Leica] Canon 1.5 Bokeh
From: "Dante A. Stella" <dante@umich.edu>
Date: Fri, 18 May 2001 08:44:20 -0500
References: <200105180235.TAA25031@mejac.palo-alto.ca.us> <009401c0df7e$5f2caa90$4d02a8c0@neurosoft.lan>

"Stanislaw B.A. Stawowy" wrote:

> > >Sorry, guys, the Canon 1.5 has exactly the same type of bokeh the 1.5
> > >Sonnar and 1.5 Jupiter have (to say nothing of the 1.5 Nikkor).  Those
> > >triangles in Kyle's picture are something else entirely.  Maybe flare.
> >
> >
> > Maybe "coma."
>
> it IS coma.
>
> Look at those circles - have dark center and bright edges.
> As front element of Sonnars (and, AFAIK, Canon 1.5 is a
> stolen Zeiss Sonnar design) have strong curvature, they
> exhibit strong coma. Circles: ( ) change into: /\
> -----
>                                 St.

Good point about the curvature.  The Canon is a Sonnar copy, but better
executed than the Soviet copy (and without benefit of the Zeiss tooling!)

In reply to: Message from "Richard W. Hemingway" <rheming@attglobal.net> (Re: [Leica] Canon 1.5 Bokeh)
Message from "Stanislaw B.A. Stawowy" <watteau@krakow.neurosoft.net> (Re: [Leica] Canon 1.5 Bokeh)