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Yes, a trifly noisy, I think the noise is sort of inescapable when shooting NB with an OSC camera (At least without a bazillion subs) with all the interpolation that has to go on to produce the data for four pixels out of one or two pixels per RGGB group of four. The straight RBG component is still a trifle noisy but it a lot smoother than the Oiii in particular, the RGB was shot in half of one night where I usually like to shoot a couple of nights on a target.
I have heard that people who bought ASI2600 mono cams direct from ZWO have started getting "Your order has shipped" emails, hopefully mine (Bought locally) is in the same batch so I can reshoot this target (At least the NB) to do a straight comparison between interpolated OSC-NB and mono NB for sharpness and noise.
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