Archived posting to the Leica Users Group, 2001/03/06

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Subject: Re: [Leica] Re: problem with my M6
From: Mark Cohen <>
Date: Tue, 6 Mar 2001 11:40:30 -0800 (PST)


I don't know, I kind of like your pretty ASCII art picture.. If you're
looking for a a job as an ASCII Artist, Im running a MUD that I could use
a logo for ;)

- -Mark

On Tue, 6 Mar 2001 wrote:

I definitely see tighter frame spacing with my 15 Heliar.

I attribute it to the fact that the film gate is not perfectly flush
with the film -- since the 15mm will sit closer to the film plane than
any of my other lenses, it follows that the light rays reach the corners
of the film plane with a more extreme angle. So, they can "sneak" under
the film gate and make the image size larger than 24x36mm (or whatever
the actual film gate size is, I haven't measured it).

It's much easier to draw a diagram of this happening than to describe
it. Here's a lame ASCII version:

		       /   \
		      /     \
		     /	     \
		    /	      \
		   /	       \
		--/		\--		  GATE
		 /		 \
		/		  \
  ----------------------------------------------- FILM


- -----------------------------------------------------------------

Mark Cohen 	(BALUG LHSA AFA)				
226 San Carlos Street #1          "MIS people have sick, twisted
San Francisco, CA 94110	 	   little minds" -Linus Torvalds

(home) (415) 970-9421		  (pager) (888) 702-9872  
(cell) (415) 290-7201		  
(work) (415) 633-1179

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