Re: Why Longer Focal Length for Planetary?

Why use a 3mm effective EP to see the planet with good size when you can use
something larger with a lot better eye relief? The powers used on the
planets are usually up in the 300x and larger to get the planet to a ince
disk. A 600mm focal length means that you need a 2mm EP to get that much
power. Better to use someting much longer of a focal length so you can at
least look into the EP.

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Why isn't there an Ozone Hole at the NORTH Pole?


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