10mp 10fps 1.3 crop

Started Feb 17, 2007 | Discussions thread
thx1138
thx1138 Veteran Member • Posts: 7,162
Re: 27pt AF is an upgrade? NT

T3 wrote:

thx1138 wrote:

In the case of the curent 1 series the smaller F point is less
sensitive to low light as Canon have explained.

Less sensitive than what? Less sensitive than their lower-density
AF arrays? Less sensitive than previous 1 series AF arrays? They
may be less sensitive, but I doubt that is specifically due to the
size of the actual focus point. It may be due to the density of
the focus array, since a higher density of focus points means there
is a lot more information for the AF CPU to process. Or did they
decide that, because they were going to have MORE AF points, that
they would have to make all of them LESS sensitive to light? I'm
not sure that I buy that. So does that mean that, if they halved
the number of AF points, they would then automatically increase the
sensitivity of those remaining points? I'm not sure I buy that
either.

Why does the 20D AF work at -0.5 EV and the 1D II only goes to 0 EV. Canon have stated themselves the 20D AF is more sensitive in low light as the specs show, due to the larger size of the AF sensors.

You sound like you know a lot about AF, send Chuck a email and discuss it with him.

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