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Okay Chris, ISO invariance is most definitely not a big deal; noise is the
astrophotographer's biggest enemy, and invariance has no effect on that,
and even causes a slight loss of detail in the shadows[with the 750D]. As far as astro imaging goes, all the user reviews show it as pretty much a non event. As far as battery life is concerned, less than $20 buys a 240v adaptor, eliminating the need for a battery. Why would you need more than one SD slot for astro imaging? What does a higher quality LCD screen do for astro imaging? it has zero effect on the images you produce.
raymo
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