BIG AIR Snowboarding at Night (PHOTOS - Antwerp)

Yes, that helps.

But ISO 3200 is quite workable.  The detail on the riders is sufficient.

I use S-AF-M in diamond pattern center, but most often I prefocus approximately on the spot where the rider will leave the ramp.  And when I position myself inbetween the take-off slope and the landing slope, I can roughly maintain focus throughout the jump (unless the rider comes towards me or goes away from me).

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/Roel Hendrickx/
lots of *images*: www.roelh.zenfolio.com
my E-3 user field *report* from Tunisian Sahara: http://www.biofos.com/ukpsg/roel.html