There's a few threads on here with various interpretations of the Ofest. You'll see there are two different variations - 1) the American version that is darker and has more Crystal malt, and 2) the lighter, no crystal, more pilsner based "fest bier" that's supposed to be what they drink in Germany now.
I just started lagering one tonight that's closer to #2, with 70% pilsner, 17% Vienna, 13% Light Munich.
Tettnang hops at 60 min and 30 min for 27 IBU, Wyeast Munich Lager (2308 ).
OG: 1.053
Hydro sample treated great.
For what it's worth, in the new 2014 BJCP guidelines, they've split it into Märzen (the old style of Oktoberfest) and Festbier (the paler golden beer they serve in Bavaria now).
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