When I observe the moon in any of my scopes I don't use a moon filter. I noted it eliminates a lot of fine detail from the image. From 120ED all the way up to 300mm Dob.
Here are my two tips and how to make a bright moon image manageable.
1. Make it the last thing you observe for the night - this is due to tip 2.
2. Observe with lights on or quickly flash your eyes with a torch. You do this to disable/reduce your eyes low light adaptation. Essentially make your pupils smaller like in the day time.
It's that simple. I haven't used my 2 ND filters for 12 years.
Freely admit though, attempting to look at the moon in my 12" with low light adapted pupils feels like sitting in front of a car and looking at its high beams.
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