Some guy on the IR list asked if you could use a ZX-5's autofocus
through a Hoya R72 filter, which is opaque, as far as I know.
I thought the question ridiculous, but decided to see what would happen.
I took a Lee 87, which *is* opaque, held it in front of the zx-5n with
the 20-35/4.
It locked focus, and pretty quick too.
Thinking maybe the AF was goofy, I tried AF'ing with the lens cap on.
Completely different behavior..it was actually focusing with IR light.
I know cameras can use an IR beam for focus assist, but I didn't think
they had this much sensitivity. The IR beam on the AF500FTZ isn't
totally IR, you can actually see some red, plus you're rarely doing it
in total darkness.
You learn something new everyday...
tv
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