Canon Rebel Auto Focus: How does it work?

Started Oct 21, 2011 | Discussions thread
Regular MemberPosts: 189
Re: Canon Rebel Auto Focus: How does it work?
In reply to idphotog, Oct 23, 2011

You have probably got the answers from the video, and above posters have explained the concept of 'plane of focus', and you have the idea of using the correct focus point.

But, for the sake of a quick "how to":

Don’t' use P (Program), use A (aperture priority) - it is still completely automatic in terms of exposure, but you then have the ability to control the aperture. If you change the aperture setting, the camera will automatically adjust the shutter speed so the correct amount of light still hits the sensor.

Changing aperture will give you control over 'depth of field' – large apertures will give you a shallow depth of field, smaller apertures a greater depth of field.

This will depend on the focal length of the lens, and the distance to the subject.

Experiment, look at the screen, these days we don’t need to have tables.

Just note that if the aperture gets too small, the shutter speed may become too slow (result is: blur from camera shake). In that case, you can start raising the ISO (sensitivity – the camera needs less light to make a picture, but it may be a bit lower quality.)

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