Question about Optics
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Posted on Jan 02, 2017
SOURCE: WE have an Australian Geographic
Without a porro-prism or a erect image diagonal, all telescopes show a reversed image. This is normal. There is no up/down in space. If you want to use the scope for terrestrial viewing, see first sentence. Do not use a erect image accessory for astronomy since it reduces the contrast.
Posted on Oct 25, 2010
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