Archived posting to the Leica Users Group, 1996/12/29

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Subject: Re: Jupiter 50mm/1.5 user report
From: Marc James Small <msmall@roanoke.infi.net>
Date: Sun, 29 Dec 1996 17:19:34 -0500

At 02:44 AM 12/29/96 -0800, Patrick Sobalvarro wrote:

>The most immediately obvious quality of the lens is that, at the
>apertures where I used it, it suffers from very marked coma.  Bright
>off-axis out-of-focus highlights (like Christmas tree lights) are
>smeared in an arc about the center of the image.  I don't find this
>terribly unpleasant (I like it better than mirror-lens donuts, for
>example), but it's quite noticeable -- Christmas tree lights become
>triangular. 
>
>The centers of the images are quite sharp, when I focused the camera
>properly.  These were quick shots of friends, where I had
>scale-focused the camera first and then raised it to my eye, made a
>quick attempt to focus, and shot in a couple of seconds.  It was
>indoors under available light at night, and at f1.5 and close up there
>isn't much depth of field, so a number of the close shots were out of
>focus.
>
>I don't notice any flare, even where there are bright lights shining
>into the lens.
>
>Sharpness at the edges of the images may be quite a bit worse than at
>the centers.  I can't tell very well, because the lens was wide open
>and I wasn't focusing on things at the edges.
>


Patrick

Sounds like you got a dog -- none of mine have ever done this.  Could you
send me the serial number and a description of the factory logo from the
lens ring?  I'd like to know which plant was turning out trash in which
years.  Thanks in advance!

Marc

msmall@roanoke.infi.net  FAX:  +540/343-7315
Cha robh bas fir gun ghras fir!