TAKO. INTERNET SEIT 1996.
Olympus-OM

Re: [OM] IMG Amanita muscaria

Subject: Re: [OM] IMG Amanita muscaria
From: "Piers Hemy" <piers@xxxxxxxx>
Date: Mon, 15 Oct 2012 16:15:03 +0100
I assume youhave  seen the Cognisys motorised focusing rack?

http://www.cognisys-inc.com/stackshot/stackshot.php?osCsid=fd7d0a7768f9b8697
8ef7ddddd15abc8

I agree with you (if I haven't misunderstood) that the image size changes
are likely trivial.

Piers

-----Original Message-----
From: usher99@xxxxxxx [mailto:usher99@xxxxxxx] 
Sent: 15 October 2012 03:27
To: olympus@xxxxxxxxxxxxxxxxx
Subject: Re: [OM] IMG Amanita muscaria

>>Mike, my guess is that keeping the entrance pupil stable ensures that 
there
>>is no undesired change in subject size on the in-focus image. But 
keep in
>>mind that I didn't even complete the sophomore year of my focal 
studies.

Thanks for thinking about that.  Makes perfect sens ebut I wonder how 
much the image size changes using a focusing helicoid vs that 
technique.
The alignment software seems to choke if the framing changes too much.  
Perhaps a set up  using the Z. 21/2 could be worked out
with an extension tube and a RRS screw driven precise macro rail. I 
don't know how many mm a turn of the helicoid is, but one could 
possibly keep the entrance pupil quite stable. one would have to remove 
the ext tube of course for infinity
focus and keep the lens entrance pupil in the same spot anyway.
It would be quite fussy.

Not a fully fleshed out out idea but I might try it if it can be worked 
out and is practical.

Pondering, Mike
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