Rough numbers from memory:
From my experience I have and SQM of about 20.3 mag. A bortel 1 will be about 21.8 mag. Or 4x dimmer.
With an ASI1600 (same pixels size) and QE 60% at Bortle 5 my lum generate about 2.5e- per second; at Bortel1 maybe 0.6e- per second (no moon). 10*RN^2 = 40e (unity 1600) so I would need a 60-70 second exposure (L) in bortel1 and 3 minute in RGB. But RN is improved for the ASI 6200 (1.5e At gain 100) with increased QE80% (OSC effective 80x50+80x25+80x25/300=25%) is either 40x80/60x25/30 = 30s (mono) or 90s (OSC). No problem for either.
The author stated that OSC is the focus.
For kicks -
Narrowband is about 0.08e-/s (5nm) in bortel 5 vs 0.02e-s in bortel1. 25% better QE, RN 40% less This would imply 10xRN^2 (23e) swamping for narrowband in 1200s for ASI6200 mono. This is excellent and almost never seen with any CCD camera (maybe 2-3RN^2 best case in 20 min).
The native ADC is 16bit so a large number of subs is not needed (main drawback with other CMOS). When put on a 10micron (as the author suggests) then no issue for bortel1 narrowband (20min) or LRGB (1.5min mono or 5 min OSC).
Example: compared to a QSI690 (similar pixel size) RN>4 we have a healthy full well 11000 (gain 100) vs 18000 (qsi) and require 6-7 times less exposure with the ASI. I never see exposures greater than 1800s with theQSI so a similar image (RN swamp) could be obtained using subs of 300s or so with the ASI but you would still retain 3x-4x more effective full well (shorter subs) to avoid blow out stars.
Edited by bigjy989, 18 January 2020 - 07:59 PM.