Hi Bren,
> The AF assist works by projecting
> a red/infrared pattern onto the subject, and red filters block the red end
> of the spectrum (I may be wrong here, physics was never my strong point).
> Therefore the AF assist light will be useless when the red filter is
> attached.
>
A red filter will block out most of the visible spectrum but will let red and
infrared pass throught it (that's why you see it red actually! :-). It will
not have any effect in the AF. Even opaque infrared filters allow AF and you
can't see throught those!
Greetings,
Gerard.
PS: A curious side note: I reported some time ago to the list that red laser
pointers can help AF'ing if you point your subject with the laser and use the
focusing point on it.
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