I tried the RGB experiment with my SW120 (imaging at f/4). Like Marc, I found that blue was the most problematic colour - it really caused bloating (it had UV cut), even with careful attention to focusing. Green was sharp, and red was a little hazy. This is compared to nice, sharp images with even 12nm narrowband filters.
So overall, I considered the achro RGB experiment a failure, and the NB a success.
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