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I am choosing a camera and lens.

I want to buy a Canon EOS 650D, as this camera seems to be a good point of entry into the world of SLR.

My question is in the following:

The EOS 650D has a cropped sensor, so as I understand if I use Canon 50mm f/1.8 lens, the behavior will be quite different on a smaller sensor in comparison to full-frame sensor.

What is the relation between cameras sensor size and lens focal length?

marked as duplicate by MikeW, Matt Grum, Paul Cezanne, John Cavan, mattdm Mar 31 '13 at 13:28

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The 650D has a "crop factor" of 1.6 so a 50mm will have about the same field of view of 50*1.6=80mm on a full frame.

This does not change the lens's focal length (or any other optical property) you get a "zoom in" effect because you only looking at the center of the image projected by the lens, that center part of the image is exactly what you would see with a full frame camera in the same exact situation if you cropped the picture in post processing and kept only the center area.

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