 Steven Chaitoff |
Disposable Camera Focus I was wondering if anyone knows how (or if) a disposable camera autofocuses. I once read that low-end cameras use "active" autofocus that bounces an infrared light off the thing closest to the camera to find out what it is "looking" at. I also remember once when I was young, I took a number of pictures of the outside through a car window with a disposable camera and they all turned out blurry. I later figured that it was because the camera had focused on the window and not the outside because it used active autofocusing. But now I'm wondering if they autofocus at all. Wouldn't that require some sort of chip or circuitry? I doubt a disposable camera would have anything like that inside. Are they just preset to the hyperfocal distance to maximize your chances of shooting in focus? Thanks.
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Jon Close |
Generally, disposable cameras are fixed-focus, using a relatively wide-angle lens (about 30mm) and smallish f-stop (f/8-f/11). They rely on depth of field (as you said, with the focus set for the hyperfocal distance) and the wide exposure latitude of the ISO 400 or 800 film loaded in them since the shutter speed is also fixed.
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