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I haven't had any problems with the AF, but I am fed up with having to get the sensor cleaned every 6 months.
If you're not going to make large prints then the 610 or the Df are probably a better bet.
For AP - I've noticed that the Nikon seems to have slightly better response to h-alpha than canon - but I don't know if there is any real difference in the IR filter pass band.
Cheers,
Andrew.
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