Quote:
Originally Posted by janoskiss
I agree with short answer: none.
Narrowband nebula filters are nice especially on larger Dobs. On big monster Dobs they are amazing. DGM NBP is a good value well performing general purpose nebula filter.
Lot depends on what aperture you have in mind.
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Basically I agree with the above statement...none are essential or completely necessary.
However,
A Moon filter is a nice thing to have and I use mine regularly...
If I was only going to have one filter it would be the DGM Narrow Band Pass (sold by Omega optics in the US can be bought via internet) filter is also a good all purpose nebula filter...or Astronomics UHC (I've owned both but prefer the DGM)
To complete the visual package an OIII would round things out...I have the DGM OIII...I haven't really compared others...
Good Luck!