Thanks everyone, I get it I think. I got hung up on thinking f10, no matter what size aperture, meant that the image is going to be the same level of dimness but with an improvement in resolution. All great info, I haven't learnt a lot in my 50 yrs (just ask my wife). Colin, this you submitted resonates with me, thanks.
Quote:
Originally Posted by Atmos
At the same magnification you will get the same FOV but the image will be brighter. Remember, focal length increases linearly (A*x) where as aperture (light gathering power) increases at A^x. So a 16" will gather 4x the amount of light than an 8" but only have twice the focal length given the same f/ratio.
Basically, bigger scopes make brighter images  |
I am thinking of going SCT again for the goto capability. I am rubbish at star hopping and my eyesight is getting a bit long in the tooth perhaps. Before it goes (or before I go) I would like to sight a galaxy in person. Yep haven't seen one,- own galaxy and its satellites not included that is.
I really appreciate the help from all of you who have contributed.
