Quote:
Originally Posted by astronobob
Crypeeze,
Funny, you have agreed to everything i mention, but you just explained it in a different way, and adding in EP's to confuse the issue, I am just keeping it basic for Ryan  What I dont understand is why you say that the speed of a scope is irrelevant ? of course its relevant, if you want a rich wide field view showing nebulae, then a fast scope is the go, in turn, if you want a clean well focused, magnified view of a planet, then a slow scope is needed, common knowledge mate ! Lets not take this any further 
Thanx
 
PS, sorry Ryan, just thought to offer my 2 bobs worth 
Cheers ! |
Sorry Bob but it isn't "common Knowledge". The "speed" of a scope makes almost no difference to the brightness of what you see "visually". Photography is different but this is mostly moot with a dob that is designed as a visual scope. Aperture changes the amount of light you collect not the focal length of the scope that determines the f ratio.
Your description of seeing galaxies and nebulas is the same except for the very largest objects and the only one that I can think of that will fill the field of my f8 200mm scope is the andromeda galaxy. You just use a longer focal length eyepiece.
