Quote:
Originally Posted by Terry B
I don't see a lot being achieved with longer subs with the exception of film cameras. Much more likely to waste time when a plane or satellite ruins a sub. The difference in noise would be hard for me to notice.
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Deviating OT here, but for CCD work, longer subs are the only way to go. As I mentioned in a previous post, the signal to noise ratio of a CCD increases linearly with the square root of the exposure time. This means that quadrupling the exposure time doubles the signal to noise ratio. So take the longest effective exposure you can. This applies to all forms of CCD imaging, but is especially important for narrowband imaging where filters restricted the quantity of light reaching the chip.
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That's an interest thought Fred. "Fuzzy logic" could be making a come back.
If there was a reference point or sample over a long period it would be possible to use such technologies for auto guiding.