From: "Jim Miller" 
Cc: 
Reply-To: "Jim Miller" 


IMO, the big advantage of a lightweight secondary would be the opportunity
to dramatically reduce the suspended mass of the entire secondary
hub/mirror/cell combination and as a result reduce the size of the
suspension wires and resulting diffraction.

Reducing the total upper end mass isn't quite as useful unless you have
some sort of variable balancing mechanism built into the mount.

jtm



----- Original Message -----
From: 
To: "at making" 
Cc: ; ; 
Sent: Friday, August 01, 2003 9:36 AM Subject: Re: ATM Re: Minimalist dobs.




Hello Fred,

>a very intresting thing could indeed have large very light
>secondary, a must for big dob.

Yeah, I am well placed to know what you mean. In adition, if big Al ;)
could make the Nagler 31 mm etc... out of lightweight material that would
be great too. Plastic lenses? But what about quallity and durability? =:-|
The same for CCD cameras etc etc...

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