Quote:
Originally Posted by evltoy
Where did you read about the ADC having a sweet spot at f10?
I would be able to do this as my ES Barlow is a 2"  |
Not a sweet spot, just greater than F10 so your x2 is a winner. Good ADC information can be found in the Planetary Astronomy book page 77.
"The corrector must be used with a focal ratio F/D greater than 10".