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So your new scope would be the 12" F8. Okay, then don't you really want to know what the equivalent exposure duration would be going from the 10" to the 12" (not the other way around), right? In that case a 15 minute exposure with the 10" F10 would become a 10 min exposure on your 12" F8 (0.64 ratio). If you were to bin 2x2 with the new 12" its exposure equivalent would be 2 minutes at 0.91 arcsec/pixel.
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