Gee I don't think you can even compare these chips to each other.
The 6303e has much deeper wells and much higher QE, but the QE peaks at Ha.
So It's great for NB and I can do 40min subs at 3nm NB without blooming (usually) but it blooms to hell quickly in LRGB.
I wouldn't pick the 6303 for mainly LRGB galaxy's at all IMO.
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