----- Original Message -----
> With a CP on the front, you still have a f/2.8 lens. The size of the
aperture
> has not changed. There will be less light getting to the front of the
lens, and
> therefore to the AF sensors. But it would be more accurate to compare it
to
> shooting on a cloudy day (when the sun is 2 stops weaker), instead of full
> sunlight. If your AF slows down on a cloudy day, I would expect it to
with a
> CP.....................
> Geoff Doane
Sounds like a reasonable assessment there Geoff. I still can't quite fully
understand the impact of the filter on the sensors. Your example is quite
correct though. If the light level drops around 2 stops it is hard to notice
the difference in AF performance, whereas when I fit the 2x TC the
difference is immediately obvious. As I shoot around 50 - 100 rolls a month
at the track in demanding conditions I have become very sensitive to this
aspect of my equipment.
I will be interested to hear Mat's response as he sounds like he has had
first hand experience with this.
Regards, Tim
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