01-30-2012, 08:21 AM
[quote name='Sathe Wild' timestamp='1327903589' post='15294']
The new p&s that uses CDAF AF has this to say:
http://www.dpreview.com/news/2012/01/30/...0_DSC-WX50
"In its description of the TX200V's fast AF, Sony suggests that the camera compares out-of-focus images to determine which direction to move the lens to achieve focus, avoiding the camera scanning for focus in the wrong direction. This sounds a lot like phase-detection to us but we're still chasing for more information."
[/quote]
Uhm... that is what contrast detect AF always does. It compares OOF images to determine if it is moving in the right direction. And it keeps on doing that till a next image is more OOF than the last, to know if it has reached focus. Then it needs to take the last step back.
The new p&s that uses CDAF AF has this to say:
http://www.dpreview.com/news/2012/01/30/...0_DSC-WX50
"In its description of the TX200V's fast AF, Sony suggests that the camera compares out-of-focus images to determine which direction to move the lens to achieve focus, avoiding the camera scanning for focus in the wrong direction. This sounds a lot like phase-detection to us but we're still chasing for more information."
[/quote]
Uhm... that is what contrast detect AF always does. It compares OOF images to determine if it is moving in the right direction. And it keeps on doing that till a next image is more OOF than the last, to know if it has reached focus. Then it needs to take the last step back.