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ROR open or slit?
I have a roll off split roof observatory, so i can open wide or just leave a narrow aperture for the scope to peer through. So what are the advantages and disadvantages of the two options? Does a narrow opening cut down dew formation? Is a narrow opening likely to have worse seeing because of air currents swirling through it due to body and equipment heating. Or doesn't any of this matter?
Geoff
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