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Mirrors, faster, slower, f, etc.
Being a newbie to this, I'd love some help understanding some of these terms. I hope this is the right place to post this. If not, mods, feel free to move it.
I now know that magnification is calculated by dividing the focal length by the mm of the eyepiece. M = FL/EP
However I'm a little confused about the 'f' people mention. I know that 'f' in photography has to do with the focal length and aperture. I assume it's the same for astronomy - f/5, f/3, etc. referring to the focal length of the primary mirror. Would this be correct?
In the same sentence, I also see people mentioning faster/slower mirrors. What does this mean?
Thanks,
Af.
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