From: "James Lerch" 
To: "ATM List" 
Reply-To: "James Lerch" 


----- Original Message -----
From: 



> You have put your finger on the very difficulty I encountered when
> I crunched the numbers on my first attempt at a digital LWT.  Where's
> the durn center!

Couldn't the center of the mirror be defined as the digital center of the
image?  Just how accurate does the center need to be known?  For example,
lets say a 20" mirror occupies 300 pixels in width, we should know the
center within 0.066" (or possibly better).

I thought the critical part was knowing how much the WIRE moved laterally
rather precisely, then measure where this moved the shadow on the image..

Looks like its about time to modify Robo-Foucault to do the LWT as well :)

Take Care,
James Lerch
http://lerch.no-ip.com/atm (My telescope construction,testing, and coating site)

--- BBBS/NT v4.00 MP