In a message dated 3/14/02 5:47:38 PM Eastern Standard Time,
pilotstar@mindspring.com writes:
<< Are passive shields that are extensions of the telescope tube
as good as electric heater element ones? >>
Hi Ernie,
The passive shields work pretty well on most nights from late fall through
early spring when the air tends to be drier. However, you can't beat the
heated models as they completely eliminate the dew problem at all times of
the year. I have both for my C8 and use them according to conditions. If
you're buying just one, I'd opt for the heated models - Orion, Kendrick, etc.
The Schmidt-Newtonian corrector is likely to be very prone to dewing up -
even more than the shorter tube SCTs.
Hope to see you this weekend if we can all manage to get together,
Doug
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