Why are Schmidt-Cassegrain telescopes (SCTs) often used to photograph NGC 2392?
Answer
They have long focal lengths
Astrophotographers often choose Schmidt-Cassegrain telescopes because of their long focal lengths, which can reach 2000mm or more. This allows the imager to capture the small, intricate details of the nebula's double-shell structure, which would be lost in telescopes with shorter focal lengths.
Related Questions
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