Moonfilters and secondary shadow

[bombassa]

It was all clear last night. My wife and daughter (who is ill) went to bed early so I decided to go out. I tried looking at the moon but the 'shadow' of the secondary was clearly visible at most magnifications. I think this is probably because the bright light makes my eyepupil smaller than the exitpupil of the scope and eyepiece and I guess I need a moonfilter to fix this.

But how 'strong' should this filter be for 5"? I'm also looking at a 8" dob so I should probably ask advice for filter strenght for 8" as well.

When I use the scope in daylight this shadow is always visible. I have read that for instance the small maksutovs are proposed for daylight viewing but isn't the secondary shadow visible in this design as well?

Thanks

[todd8137]

never add that prob but i have about 5 types of moon filters and its try an see the one i like the best is the 2" neodymium filter its great for planets and the moon

[nicnac]

the neodymium is great for taking the glare off, i have one and a variable polarizing moon filter too (twist to alter degree of shading)

First Light Optics - Variable Polarizing Moon Filter

First Light Optics - Baader Neodymium Filter