Go Back   Steve's Digicams Forums > Digital Cameras (Point and Shoot) > Canon

Thread Tools Search this Thread
Old Jan 29, 2004, 4:01 PM   #1
Junior Member
Join Date: Nov 2003
Posts: 11
Default G2 Autofocus

Does anyone understand how this system works? I have a Tiffen Wide Angle lense mounted that blocks the A/F Auxillary Light however the autofocus still seems to function. Does the system actually operate via the lense?
johnny999 is offline   Reply With Quote
Sponsored Links
Old Jan 29, 2004, 7:45 PM   #2
Senior Member
Join Date: Jun 2002
Posts: 227

While I'm not positive as to 'how' AF works it does work by looking at the image through the lens. The system uses phase shifts in the light reflected off the object to determine focus. It isn't using the light to determine distance like a laser rangefinder.

The auxillary light provides illumination on the subject for the AF system to work. If you block the AF assist light all that will occur is that the camera will hunt for focus in dark conditions or on objects without a lot of contrast.

A trick I use with my G2 is to 'aim' the camera with the AF light when I'm shooting kids with the camera at waist level. Looking at the LCD would work but then I can't keep an eye on the kids.
ursa is offline   Reply With Quote

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

All times are GMT -5. The time now is 2:08 AM.