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In scope vs lens battle scope is a clean winner. Larger (in most cases) aperture, less lenses that reflect or absorb light,lens coating customized for astronomy, much lesser number of moving elements (think auto-focus and optical stabilization - both useless in astrophoto). All of this will contribute to better image from equal focus length telescope as compared to photographic lenses. I don't say lenses can't be used - they may be pretty good, too.
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