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One thing to remember DO NOT TOUCH THE FRONT LENS ASSEMBLY! If you want to correct collimation loosen the six bolts at the back of the scope and then adjust alternate bolts until the out of focus annulus is symmetrical at a high magnification. Then tighten each opposite bolt gently until all bolts are secure without losing the symmetry of the annulus.
The mirror in the TALs is a conical tapered type held in the centre by it's centre and these six bolts adjust its position in a spherical cup so it it is easy to align.
This is the other advantage centrally held conical mirror and no corrector plate! Cools down very quickly and never has condensation problems!
Bert
Last edited by avandonk; 18-12-2006 at 08:10 PM.
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