Quote:
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When you are allowing 2x mag per mm of aperture don't forget to allow for the secondary mirror.
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Sorry I do not follow here? Are Newtonians restricted by the size of their secondary mirror?????
Thanks all for your helpful comments
decisions decisions and more cloud
BTW on my scope the motor drive moves the scope via some kid of friction nut, so when it sets itself up it can hit the stops and then sort of knows it has gone past and resets itself (clear as mud?) Of course it is so slack that near the horizon with a weighty eyepiece it just slides down! So I go the chance to pull the housing off and tighten up the friction bolt which cures the problem. Of course this is a worst case scenario for the telescope as the balance is out. Anyhow the battery voltage has dropped after weeks of use to 8 volts (an alkaline) and cannot elevate now against the added friction! Some twaeking and in goes one of my new NiMH batteries and we are away.. Success at last. Now if only the cloud will go away.
I will certainly consider that Orion acufocuser too.