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diam .......area refractor area sct
2 ............3.142
4 ...........12.568............. 9.426
5 .......... 19.6375.......... 16.4955
6............ 28.278........... 25.136
7.................................. 35.3475
8................................. 47.13
9 ................................ 60.4835
10................................ 75.408
As you can see by the table above, there's a lot of difference in the area of the objective lens/mirror between 6 and 8 inches- no one can afford a refractor over 6 inches!!
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