14mm would be good too. I found the 13 was optimal on nights with ordinary seeing. The seeing at my home is very ordinary but there are two sites I have access to that can turn on excellent seeing quite often due to their terrain and microclimate.
I'm using a Vixen SSW 14, 10 and 7mm and SLV 25, 12, 10, 9 with my current mak (f/13.5) and I also have 6, 5 and 4mm for "insane" power...
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