Quote:
Originally Posted by gb_astro
Likewise Renato with your f4.5 dob.
Your aperture stop is just reducing your f-stop down to f10 or so where collimation becomes less critical.
If you are not seeing concentric rings at f4.5 the scope is just not collimated correctly.
gb.
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My Cheshire eyepiece says it's collimated, and after it has cooled down, the telescope has delivered more detail on Jupiter than I've ever seen in any other telescope.
And my aperture mask has a 6", a 5" and a 4" hole cut out of it, corresponding to f/11, f/13, f/16, and each gives me a perfect bullseye pattern on a defocused star and very slight flare on the outer ring in the direction of the mirror's outer edge.
How can it not be collimated correctly?
The only difference from it and most other telescopes, is that the secondary isn't held in four spider vanes, but on a hemispherical arc/vane.
Regards,
Renato