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Paul, I'm pretty positive mine is F/8, and it was the first one bought in Australia... I've done a few shots and matched the FOV in CCD Calc/Starry Night/The Sky... My images show the exact FOV that starry nights indicates the ST10 should give me in a 203mm F/8...
I know the 6" are F/9.. But i'm quite sure the 8" RC's are F/8.
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