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Oh, using a telescope through a flyscreen is fine. The flyscreen is so far out of focus it won't bother the image. The flyscreen will drop the brightness of the image by the amount the flyscreen blocks out the light from the Main Mirror. Windows are not optically flat, so they distort the image.
Oh! Cross Hairs are the hairs that cross in your finder scope, since they were originally, and still are sometimes made from hair.
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