On Thu, 12 Jul 2001, Mortimer Snerd wrote:
> Absolutely. The less light the autofocus sensors get,
> the slower AF is. You lose about 1-2 stops from having
> a polarizer on, so your lens will focus as if it's an
> f4 or f5.6 300mm. I have observed this firsthand...
You are probably right about the slowing down, but this of course is
still a bit different to having a F4 or F5.6 lens in regards that the real
aperture is still larger and thus the camera will use cross-sensors (on
EOS 3's and 1-N/V's...)
> the other problem as you note, is that the shutter
> speed can drop too low, which can result in blurry
> pictures if you're not panning carefully.
This is true, specially with longer lenses.
> Also, one of the things you will never really read
> about anywhere else is that a polarizer can result in
> some really unnatural "rainbow" color casts on
> windshields and windows of race cars that have
> plexiglas or Lexan(tm) parts on them.
If you have polarizer sunglasses, you'll see the same... looking out from
most modern cars side or rear windows shows the same effect. The front
window seems never to be like that. And thus enables one to wear polarizer
sunglasses while driving.
> Polarized light also does absolutely bizzarre things
> with some of these refractive paints like the DuPont
> "Chromalusion" which isn't always unpleasant, but it
> is strange.
:-) I must try to see this sometimes...
> In most cases it's my considered opinion that a
> polarizer is a bad idea for race cars on the track if
> you're AF'ing.
One opinnion for using polarizer is that, then you'll be able to see the
driver inside the car. After all to most people it's the driver that is
important (for me, it's usually the car... GT endurance racing, Le Mans
and such :-). Or if you are photographing some formula cars (or other open
cars), it is possible to see the drivers eyes. There was a good story
about these in the EOS-magazine while back when I still ordered it. (They
have a few stories in the magazine, and then tutorials... I kind of grew
out of the tutorials as then they seemed to just scratch the surface of
some technique, and tented to repeat them selves. The stories, and the
photographs assosiated with them were good.)
Best regards
Hugo.
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** Hugo G�vert **
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