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How to stimulate zooming?

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In directx, moving the postition of the camera to and fro can stimulate zooming?

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Yes, changing FOV is the right way how to do it.

If you halve your FOV, you get 2x optical zoom.
1/4 FOV = 4x optical zoom, etc.

Changing camera position doesn't make a belivable zoom effect. While zooming in, the perspective distortion is decreasing and the view is becoming more "flat" (because you're lowering FOV); this isn't happening when moving the camera.

Also - good is that zoom based on FOV is really easy to implement. It's good when the right solution is also the easiest, isn't it? :D

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