ZWO 31mm H-alpha 7nm Narrowband Filter - UNMOUNTED - Mark II 3x barlow lens the Horsehead Nebula (IC 434)

the Horsehead Nebula (IC 434)

So it is not a "must

Adjustable Light Intensity: Fine-tune brightness in 100 steps

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ZWO 31mm H-alpha 7nm Narrowband Filter - UNMOUNTED - Mark II 3x barlow lens the Horsehead Nebula (IC 434)Narrowband filters are used to create high contrast deep sky images of certain objects, mainly emission and diffuse nebulae (i. e. Veil Nebula, M42 Orion Nebula, North America Nebula, Horsehead Nebula) or planetary nebulae (i. e. M27 Dumbbell nebula, M57 Ring Nebula, Helix Nebula), just to mention few of well known nebulosities. Narroband filter sets are sometimes used instead of LRGB filter sets and sometimes in combination with them However, if you