Quote:
Originally Posted by Trekrider
Thanks Rick, That's the point he was making, hence my question - rather than fix the oversampling find a camera that is actually correct for the scope.
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Barry,
Using a reducer is a reasonable strategy but a larger pixel camera makes sense too. You could look at a camera with an ICX-694 sensor (0.58 arcsec/pixel - still a bit small but very good if you get the occasional night with exceptional seeing) or a KAF-8300 (0.69 arcsec/pixel.)
A good rule of thumb is that perfect sampling is when the seeing is about 3.5x the image scale. Oversampling is wasteful. Undersampling is fine if you're looking for a larger FOV and willing to trade off resolution to get it.
The ICX-694 has pretty low read noise. The KAF-8300 is a bit long in the tooth and has fairly high read noise, so you'll need to do longer subs to get the best out of it.
Cheers,
Rick.