Re: SL3Dtelescopes

[T3D John Bercovitz <bercov@xxxxxxxxxx>]

> It has been reported by several or many observers that when 
> conditions are right, you can focus on a star, and rack the 
> focus back a bit to image the turbulence. 
 
I think, in a way, this may be the basis of Bill's observation that 
the large aperture helps depth perception.  If one thing is sharp and 
the other fuzzy, and they are immediately adjacent to one another in 
your field of view, you know they're not in the same "depth plane".  
This is not parallax-based stereopsis, of course, but one of a long 
list of additional depth clues.
 
>> (No, he's not on this list.)  
 
> You're kidding, right?  I have to re-post that last essay to p3d?
 
Sorry, not kidding.  However, if people on this list would like to 
see that changed, I think it's perfectly reasonable to have him here.  
Certainly the SL3D topic is technical enough.  I've known Bill off 
and on for nigh on to 45 years and I will vouch for him being one of 
the nicest guys you'd ever hope to know.  Allan W is also known to 
me personally and is very kind.  I think Paul Kline is a good man and 
I believe he is technically adept at the level of the other people on 
this list.  That's the SL3D crew.  Shall we add them en masse and 
transfer the topic to tech3d?  What would interested photo-3ders think 
if that topic disappeared from their list?  That topic started on the 
photo-3d list before this list was even a twinkle in Bob's eye.  Reply 
to me off list unless you want your reply recorded for posterity in 
the archives of tech3d.  8-)
 
John B
 

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