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Thank you all for your answers.
So I assume the same principle would apply with aperture (f ratio?). Using the same focal lenth of 750mm, let's say it was an f/5. If I were to use a 2X barlow that would double the FL to 1500, but would that also reduce the aperture by half?
In other words would a 750mm-f/5 scope using a 2X barlow be the same as using a 1500mm-f/10 scope without a barlow?
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