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Hi,
what would the difference be visually when using the same eyepiece, say 25mm between an F4 scope and an F6 scope?
would the object be slightly bigger in an F6, but will there be a difference in brightness in an F4 as its a faster scope?
do faster scopes gather more light? i don't really understand how it makes such a difference in astrophotography as it reduces required exposure time dramatically.
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