Brendan wrote:
> while I will say the MZ-s is faster, seems more
> accurate I still wish
> it had a central cross sensor.
Why?
(snip)
>I wonder if Pentax intentionally left a cross
> sensor out for
> some reason but it still can not lock on some small
> subjects a cross
> sensor would.
If I have understood the patents correctly a Pentax doesn't need a cross sensor. A
cross sensor is used for making the AF sensor sensitive for both horizontal and
vertical lines. The MZ-S is sensitive to both vertical and horizontal lines.
Practically speaking the MZ-S has six cross sensors. It works by mirrors. All sensors
are divided into two segments. The mirror system invert the lines for one of the two
segments. This means that regardless of the orientation of the original line one of
the segments will get the orientation the sensor is sensitive for. Eg if you have a
vertical line the sensor will see a vertical and a horizontal line. If you have a
horizontal line the sensor will still see a horizontal and a vertical line. In other
words the sensor don't need to be sensitive to both horizontal and vertical lines but
only for one of them.
P�l
-
This message is from the Pentax-Discuss Mail List. To unsubscribe,
go to http://www.pdml.net and follow the directions. Don't forget to
visit the Pentax Users' Gallery at http://pug.komkon.org .
