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What is important is that in hindsight binning X2 always gets you more signal by a factor of four for the same exposure. With a modern CCD camera your read noise also is reduced by a factor of four.
My optic is an F3 200mm clear aperture of 600mm FL. In reality because of the central obstruction of 106mm it has the approximate light gathering power of a refractor that has an aperture of 176mm and FL of 600mm.
One could argue till the cows come home about losses at each surface of refractors versus mirrors and compound systems like mine.
The take home message is all you folks out there with slower systems binning X2 and drizzling with PixInsight works.
My next test will be RGB data if the clouds ever go away. Bert
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