" SCTs corrector plate can contribute to CA because technically it is a lens, the prescription is weak and is zero"
The primary aberration is not the usual chromatic where colors focus at different points but rather?convoluted spherical aberrations.?This is not unexpected because the job of the glass is to remove spherical.? The effect is small but does manifest in very high res imaging.??The usual SCT "sweet spot" for minimal spherical is in green light but that can change depending on the mirror spacing (which in turn is?determined by backfocus distance).? So an SCT can be tuned (wittingly or otherwise) to optimize red.
"...Human vision is way more sensitive in green..."
In?a case where the best resolution is red (for whatever reason) then neglecting the red signal and doubling (or more)?an inferior green signal (for whatever reason) will?result in lower overall resolution.? This is especially true for Bayer because the effective red pixel size is double the actual pixel sizes (because there is a?blank space between every red pixel).
"When you image mono, you get 4x green pixels"
The correct multiplier is 1x.? Every pixel in a mono camera participates in whatever filter is used.? So for every red pixel in a combined 3-filter/color?image there is?1 green pixel and 1 blue pixel.
"I have never seen the potential higher resolution actualized in my rig"
Have you really looked?? That would require using a mono and Bayer camera on the same night (preferably within minutes of each other) and/or extensive use of mono and Bayer over long periods.
"Hey, what am I, chopped liver?? :)"
You are obviously the exception that proves the rule! <g>
Though I have to wonder what you might be capable of?using a ZWO ASI120MM.
Stan
