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Darryl
The "live view" is simply a fast image update with the mirror up (much faster than SBIG focus mode BTW), it has no other function for astro pics other than for focus, has no effect on long exposure imaging what so ever, different mode, it can be viewed on the cam LCD or on a PC via USB . The short exposures in live view mean it is not very sensitive, but I have found focusing on bright stars (even if you have to slew away to find one) is an absolute snack, a very worthy feature. Yes, pixel size is a factor in well depth and QE, but massive oversampling has proved to be a bonus, despite the math.
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