|
Focal Ratio
Hey guys 'n' girls,
just a quick one in regards to focal ratio. as i am still new to some of this, im getting confused with focal ratio. i know that a shorter focal ratio is better for deep sky and longer for planets/moon etc, but what i dont understand is which way it goes. for example if i had a telescope that was f/5 would that be the short focal ratio or would say one with f/15 be the shorter one? ive seen that Dobs are around the f/6 mark but the Maksutov-Cassegrain are about f/13. any help would be greatly appreciated.
cheers
Benno
|