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Astral Traveller,
why is it that the opening to Newtonians are left open? Surely the cost of some non reflective glass over the tubes opening would add very little to the cost of the scope and thereby preventing dust etc: falling onto the primary mirror. Given that the mirrors coating is on the surface of the glass makes the argument in favour of a 'dust-cover" glass sheet even stronger. I have seen one or two Newts that look like Macs it just seems to make good sense to cover the opening is the a reason why the openings to Newts are left open? Is it just a cost thing?
I have seen flocking used in non-astronomical applications. I have a small Newt, where can I source flocking? The tube of my Celesstron just has a coating of Matt black paint, nothing more.
David
Last edited by Visionary; 30-01-2015 at 11:20 PM.
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