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Note the UHC narrowband filter typically includes the O-III and H-Beta emission lines and is an excellent all purpose filter but transmission and spectrum can vary between makes.
The O-III and H-Beta complement the UHC and for objects such as the Horsehead nebula, you need the H-Beta to see it more easily since contrast is further enhanced. However I would not recommend the H-Beta as your first filter since it blocks the O-III part of the spectrum.
Go the UHC first, O-III second and H-Beta third if you want.
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