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Yep, youre right, maths was wrong.
Essentially what i mean to ask is, is there any benefit to going a large scope with a reducer vs a smaller scope giving 'roughly' the same focal length and f'ratio. Like large aperture gives more contrast for example (even after reducer added to light path), or pros & cons of reducers vs native.
If for example i was happy to image at roughly 600mm focal length, then would it be recommended to get a native 600mm scope, or a large scope with a reducer for added 'benefits'.
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