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I agree with Gary.
The type of scope is not critical, but reasonable to good quality optics helps a lot.
The important thing is good seeing and also that it is high in altitude.
I split it fairly regularly in my 10" dob and split it on a reasonable number of occasions previously in my smaller dobs (6" and 8"). I certainly don't need an aperture mask to split it in the 10" when conditions are favourable. Sometimes you need medium to higher powers 200X plus in the 10", on some occasions under excellent conditions it splits at 120X with a 10mm Pentax XW. As Gary mentioned an OIII or UHC filter helps but I don't find any assistance necessary in the 10", if it won't split I know its because of the conditions so I just move on.
I recently split it in Louies 4" TAK FS102 under good conditions using about 200X.
CS-John B
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