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SBIG ST-7/8 NAGB or ZWO ASI183MM-Pro

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CrossoverManiac
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SBIG ST-7/8 NAGB or ZWO ASI183MM-Pro

I currently have an SBIG ST-7E NAGB.  Should I use that over my ASI183MM-Pro and if I have a chance to upgrade to an ST-8XM, should I take it even if I have to either user a Barlow lens or buy a scope with a longer focal length for the 9-µm pixels in the ST-7 and ST-8 or should I just stick with the ASI183 with its 2.4-µm pixels with my current scope which has a focal length of 731mm even if the 183 only has a 12-bit A/D conversion.  Also, would it matter since the ST-7 and ST-8 has a 15 electron read noise as opposed to the 3 electron read noise of the 183?

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