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Your missing a 5x Powermate, which i forgot to mention. F50 means my F10 with a 5x barlow. A barlow is a lens that increases your focal length by a specific magnitude. And hence a barlow increases your magnification by the same magnitude. A Focal Reducer has the reverse effect of a barlow, ir reudces the focal length by a magnitude. A 0.5x focal reducer will make your F10 into a F5. The most popular focal reducer is sold as a 6.3 this is actually a ~1.5x but the label it 6.3 because it will reduce a F10 to F6.3.
Thats Barlow's 101 for you. So my 32mm EP in a F10 scope is 63.5x in a F50 scope its 5x that, which is 312.5x.
This is not a freebie though there are penalties in magnification. The focal ratio is an indication of the speed of the Optics, A F10 takes twice as much time to gather the same light as a F5. And 1/5th of the time to gather the same light as an F50. So you get magnification, but the penalty is you need to track the object longer to capture detail (photons of light).
I am not expert so some please jump in and make any corrections.
Regards
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