Posted by Pat Horridge on 10/04/06 16:13

"Steven H" <steven@sounddevelopment.com> wrote in message
news:1159968468.666925.314670@m7g2000cwm.googlegroups.com...
> But why is the depth of field so wide. Is it the size of the CCDs
>

The depth of field is a function of how wide the iris is open and the size
of the lens (diameter)
Due to the sensitivity of the CCD (every one wants low light response) in
bright light the iris has to close right down and this increases depth of
field.

So the answer is to stick ND fitlers on the front of the lens.
You need to make sure the gain doesn't come on to compensate for the low
light and thereby close the iris again.
Ideally you want the iris to be almost fully open.
Even then you are limited to what sort of effect you can achieve.
You need a great big appature lens to get good depth of field (or should
that read shallow depth of field)

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