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Good link Ray.
This is why I got an AP RHA 305 F3.8 ad has been my exact experience with it so far. Its also why I am keen to use the reducer on the CDK17 when I can.
A 5 minute Ha image using a 5nm Ha at 1x1 binning is probably as smooth and noise free as a 20minute F7 image.
It speeds up imaging by a factor of 3 or 4 at an educated guess over the more typical imaging at F7/8. Its probably about 2-3 times as fast as an FSQ106 even with a narrower FOV. Couple that with nearly 80% QE of Sony ICX sensors and you've got a very fast imaging system which reduces the problem of the variable of astrophotography weather (cloud, moon, wind).
Greg.
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