Quote:
Originally Posted by mbo
The 10" gathers about 56% more light than the 8", I think you are correct about their portability being fairly similar, though that depends a lot on the individual lifting the scope, will the salesman let you test lift them in the shop  . If the price per square inch seems fair, and you are happy to pay extra for it, it's probably a good idea to go for the 10".
The differences in focal length won't mean a lot in practice (at least to most people) The 8" would be f6 and the 10" f5. This means that for any given eyepiece the magnification would be a bit higher on the 8" scope, but the brightness would be lower. The scopes probably come with eyepieces to match their focal lengths. |
Apologies if i have this wrong, but the magnification from the eyepieces on both scopes will be the same, as :
Magnification = Focal Length / eyepiece (mm)
As they both have a Focal Length of 1200mm Mag remains the same
The speed will be different (F Ratio)
As the 8" has a 200mm mirror 1200/200 = F6
The 10" has a 250mm mirror 1200/250 = F5
Stuart