Cross-type focusing points

Joined
Sep 4, 2006
Messages
184
Location
United States
The D3/D300/D700 all have 51 focusing points, 15 of which are cross-type. Which ones are they? Can't find anything in the documentation on this.
 
K

KG72

Guest
There are two types of focus sensors in DSLRs. Vertical Line Sensors and Cross-Type Sensors.

Vertical Line Sensors are one dimensional contrast focus points. They detect and focus on contrast along a vertical line and are generally considered to have a lower accuracy except for when detecting contrast along a vertical line.

Cross-Type Sensors are two dimensional contrast focus points. They detect and focus on contrast along both a vertical and horizontal line. Thus providing higher accuracy in focus.

There is a good article on Autofocus and how it works here:

http://www.cambridgeincolour.com/tutorials/camera-autofocus.htm
 
Joined
Jul 6, 2006
Messages
198
Location
Dortmund, Germany
There are two types of focus sensors in DSLRs. Vertical Line Sensors and Cross-Type Sensors.

Vertical Line Sensors are one dimensional contrast focus points. They detect and focus on contrast along a vertical line and are generally considered to have a lower accuracy except for when detecting contrast along a vertical line.

Cross-Type Sensors are two dimensional contrast focus points. They detect and focus on contrast along both a vertical and horizontal line. Thus providing higher accuracy in focus.

There is a good article on Autofocus and how it works here:

http://www.cambridgeincolour.com/tutorials/camera-autofocus.htm
Thank you for the explanation & the link. It was very informative.
 
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