Re: MX + 600mm = image cut-off viewfinder?

[Peter Alling]

It starts to darken with longer focal lengths the longer the more 
pronounced.  The effect is due to the geometry of the light path. It's not 
blocked, the path is actually off the bottom of the mirror, it's hard for 
me to explain without diagrams.  On my MXs the darkening is apparent but 
there is still some image at the edge even at 600mm.  Needless to say you 
don't see this effect with cameras equipped with longer mirrors such as the 
LX.  By the way I just tried to mount a LX screen in a MX and I had no 
problems.  I hate to think you might be having more equipment problems.

At 01:43 AM 9/4/03 -0700, you wrote:
Hi Peter,

Mind if I ask again? "Blackout" you mean just darken but still see 
something at the top edge, or mean the edge is blocked and shows nothing?

Alan Chan
http://www.pbase.com/wlachan
I'm commenting on the blackout of the upper edge of the image in the 
viewfinder not your modification.  In fact if you're not seeing a 
darkening in the viewfinder before your modification I think mirror and 
focusing screen are a bit out of alignment to start with.

At 10:01 PM 9/3/03 -0400, I wrote:
It's normal, and I'm sure you're going to get a great deal of technical 
explanation as to why.  If you don't I'll explain further.
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