I trust you, Bob-). I just happen to know that this lens is a bit dirty as 
well. Too much time shooting hot rods on dusty streets. But I'm definitely 
behind on sensor cleaning. I normally do both cameras every two weeks or so, 
but I bet I haven't done it at all this summer.
Paul
 -------------- Original message ----------------------
From: Bob Shell <[EMAIL PROTECTED]>
> 
> On Jul 31, 2006, at 9:16 AM, [EMAIL PROTECTED] wrote:
> 
> > You're right of course. But generally when I've seen sensor dirt  
> > it's much more of an indistinct circular blob, and I've never seen  
> > it in black. But I'll clean both sensor and lens. Both are overdue.
> 
> Just like dust on slide film prior to exposure, sensor dust will  
> block light and show up dark or black.  Most sensor dirt I have seen  
> is pretty distinct in outline.  Don't bother cleaning the lens.  This  
> has nothing to do with the lens -- trust me.
> 
> Bob
> 
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