what does 20mm and 50mm differ in telescope lenses?
Tuesday, May 11th, 2010 at
9:33 am
i wanna know if 50 mm is good for looking at far away planets like jupiter and saturn
US $34.99
A 50mm lens will ‘gather’ a bit over 6 times as much light as a 20mm lens, so yes, it will give you a ‘brighter’ image.
HTH ☺
Doug