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Old 08-03-2008, 09:28 PM
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RAJAH235
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RAJAH235 is offline
 
Join Date: Jan 2005
Location: South Coast N.S.W.
Posts: 2,571
Yep, that looks a whole lot better than previous image.
Still just a tad off with the primary.
There's one thing that no-one mentioned. That was to check that the laser collimator beam is centred & not skewed to one side.
Easy test bench is a lump of 4" x 3" bout 8" long with 2 x 3" nails at 45 degs/crossing each other at one end & another 2 x 3" nails at 45 degs/crossing each other at the opposite end. Length between nails < the laser length.
Photo/s on site somewhere.
Edit] Found pic...
> http://www.iceinspace.com.au/forum/a...3&d=1130763353
Sit the laser in the "V's" so formed & rotate the laser while watching the beam against the wall. If it moves in a circle, it needs adjusting so it don't.

A star test will probably be all that is req'd to do a final adjustment to the collimation.

HTH.
Regs, L..

ps. Just use the Cheshire. Better unit all round.

pps. A piece of white paper taped or bluetacked to the inside of the tube, opposite the focuser will enable you to 'see the 2ndary' better.
All 'rough' collimation is best done in daylight. (In the house is good). Not night time.

Last edited by RAJAH235; 08-03-2008 at 10:01 PM.
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