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Saturn


justin138

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If you use the smaller aperture cut into the lens cap, it does decrease brightness and resolution but it also increases contrast (assuming you have placed it so that it avoids the spider-vanes) and depth of focus (focus becomes less critical). Also, the narrower beam of light is much easier for the eyepiece to correct.

The part about narrow beams and eyepieces is worth noting because when you read an eyepiece review, take a look at the scope used to test the eyepiece. If it is a slow scope, like an SCT, any old brass & glass will look good whereas a fast scope demands more from an eyepiece - it is a more exacting test.

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