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I have 5nm Astrodon filters. I was considering the 3nm Ha filter for my F3.8 AP Riccardi Honders. I asked Don about it. He recommended I stay with 5nm for the Honders but use 3nm for O111.
I was getting wonderful Ha images from the 5nm so I took that advice.
At faster F ratios the filters lose some of their narrowness so your F3.3 Tak setup would not be running at 3nm but a bit higher. I don't know how much higher but you could ask Don.
Greg.
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