You are right there Geoff. I should have been more specific.
Bazooka, when you are looking through two telescopes with the same aperture diameter, one is f/5 and the other is f/10 (ie the focal length of the f/5 is half as long as the f/10 )and you use the same eyepiece in each one, the f/5 will appear brighter and have a wider field of view because its magnification will half that of the f/10. If you use an eyepiece that is of the same contruction type in the f/5 that brings it up to the same magnification as the f/10 then the images will be pretty much the same through the central part of the feild of view.
Hope that clarifies it a bit.
