is the focal length in a telescope better when it is larger or smaller?
Posted March 21st, 2010 by admin 3 Comments »
snail asked:
is it possible to build your own telescope? the larger the mirror the more light it gathers what about focal length? some advertise for example 10 inch mirror with f 4.5 what does that mean?
is it possible to build your own telescope? the larger the mirror the more light it gathers what about focal length? some advertise for example 10 inch mirror with f 4.5 what does that mean?