From: "Tim" <tjp314@pacbell.net>

Date: March 8, 2006 12:40:24 PM MST

To: Astro_IIDC@yahoogroups.com

Subject: Going to try building a 12.5" f/3.5 astrocamera

Using a 12.5" f/3.5 full-thickness primary and a plywood tube I built for my cassegrain years 

ago.

But instead of the gimongous secondary mirror that came with it, I'm going to mount my Flea 

right at the prime focus of the mirror.  Only thing I have to figure out is the focusing 

mechanism.  I'm thinking of mounting a curved spider on a pair of ball bearing drawer slides 

so I can move the camera via a threaded rod and travelling nut (focus  knob), controlling the 

backlash by having a spring preload on the assembly.

Got to run to lunch, more later.

-Tim.