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(I'm posting in the eyepiece section, can't find the right one)
I have a question on H-beta filters, because I'd like to observe nebulae as the Horsehead Nebula.... but other amateur astronomers advised me against doing that.
I own a f/6 200 mm (~8 inches) Dobson telescope and the set of eyepieces shown here:
They told me I could not use it at its best, because (if I remember right), my telescope is too small.
And in case of buying one of these, 2" or 1.25"? There are diffuse nebulae that are wide... but the Horsehead is tiny instead (8' x 6').
I'm a bit confused...
Thanks you in advance for your advices and explanations