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Thanks Gary.
I am after a very fast large aperture for my Video Astronomy.
I have a 12" f5 but it isn't very good for Video or to put on my EQ6.
10" is the most I would put up on my mount.
And with the new GSO 10" f4 I can get it to f2 with a 0.5x focal reducer.
Just wondering if they were worth the expense.
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