Mike,
I have found lens speed always advantagous. I'd never consider using lenses
slower than f/4 for any racing applications. My workhorse glass for
motorsport is a Tokina AT-X 300 f/2.8, Tokina AT-X 80-200 f/2.8 and a Zuiko
1.4 t/c. They do not accept the 2X convertors graciously. This gives a
total range from 80 - 420mm with just three pieces to lug around. (I also
generally take a 35-80 f/2.8 Zuiko and a 21mm f/2 Zuiko and two or three
bodies) The f/2.8 max aperture gives a very bright focus screen, further
enhanced with 2-series OM screens or Beattie Intenscreens. Makes focus very
accurate.
Yes, the 300 is heavy. Especially toward the end of a long weekend when
you've been humping doubletime from one ond of the track to the other. But
I do not consider it hard to hand hold all day long. Sure, your arm gets a
little tired, and it makes the 80-200 feel feather light when you switch,
but it is doable. The results are excellent.
I bought mine new 10 years ago for $1600. I recently saw one available in
9+ condition for $1900 firm on rec.photo.marketplace. My guess is the
seller will deal, regardless of the "firm" part posted. Make sure to get
the case (well built, massive), metal hood, protective leather-like
drawstring pouch (sort of like an internal bag, also used as the lens cap)
and the 112mm front filter; it was included in the original package. Also
double check to make certain the drop filter is in place. These fall out,
leaving a rather large hole in the top of the lens barrel.
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