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Another thing to be aware of is mirror cooling.
These 12" f/5 Chinese mirrors are reasonably thick, and I find the image quality is usually fairly
crap unless steps are taken to get the mirror as close to ambient temperature as possible.
I find I have to get the scope out to its viewing position well before the daytime temperature
drops, and run the fan continuously until I want to view some hours later.
Without doing this, I find this scope fairly useless.
Cheers,
Jason.
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