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Hi Martin,
Thanks for the advice. I am a complete beginner in photography, I haven't actually bought the telescope yet. I saw I would need a coma corrector for f/4 which I assume would fix coma? Expensive though... I also got a collimator laser for $30 on ebay and watched a couple of Youtube videos on how to collimate.
So do you need a coma corrector for the bintel f/5 or f/6? If not, I might go for that option instead as it is much cheaper and more forgiving.
Cheers,
Stéphane
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