I assume at f/5 you have a newtonian of some description, StarLane?
I have the Orion 2" Ultrablock filter for my f/5 scope, but I have it on a filter slide on the inside of the OTA, so I can use it with all of my eyepieces.
With the light grasp of my scope, I tend to use filters less, but they are still handy in some instances.
The filter in question performs pretty well, the other night I tried it on Eta Carinae through the 22 Pan, and it brought out a lot more nebulosity. I will try it on Saturday night with Rocket Boy's 31 Nagler and let you know how it performs with a larger exit pupil EP.
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