Re: [ATM] More on aperature stops

["Mel Bartels" <mbartels@bbastrodesigns.com>]

> http://www.designwizardry.com/aperaturedifference.jpg
> I'm pretty sure that the image on left is pretty much
> what most people see with a 10" f/4.7 newtonian at
> 7.5mm with questionable atmospheric conditions with no

That's really a horrible image.  Any decent 10 inch will give a far superior
image.  That smear to the immediate lower lower-right of Mars indicates
horrible thermal problems adjoining the optics.  The larger smear is
indicative of scattering, poor baffling, and a bad eyepiece that's ghosting
on you (could be a poorly cleaned eyepiece).

You'll do better to tackle the problems of this 10 inch head-on, learning
from them, than trying to run and hide from them by using an off-axis mask.

Mel Bartels


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