Quote:
Originally Posted by Blue Skies
Rotating optics even just a smidgin to get a good match can have a big impact on the quality at the eyepiece end, so it's still a good idea to keep the same orientation of the corrector plate if possible.
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I couldn't agree more. All I was trying to get at is that I can see how a new corrector could be installed as long as the orientation of the secondary is maintained.
If removing the corrector I'd ensure it was orientated as close as possible to its original position when reinstalling it. As long as you don't remove the secondary from the corrector, this will ensure the correct orientation of the secondary.
As I understand it, corrections are only applied to the secondary after the primary and corrector have been chosen.
What I'd really like to know is how much of this correction is due to errors in the primary and how much to errors in the corrector.
My gut tells me:
Primary errors: 90%
Corrector erros: 10%
as the primary is a very steep f/2 curve while the figure of the corrector is very slight.
If this is true, I can see that correctors can be replaced with minimal optical degredation as long as the secondary orientation is maintained.
Anyway, this is just my gut feeling. It would be great to hear some more about this.
Have fun,
Doug