G'day.
Im no expert but have been told it comes down to light gathering power which is worked out like this.
10" 10x10 = 100
12" 12 x12 =144.
Sorry i have no other link for you but im sure others will be able to help.I have a 12" gso dob and have also looked in the 10" and well just maybe a slight difference between the 2.
