Zoom and Focus

Point-and-shoot cameras come with either fixed focus or autofocus. Fixed-focus cameras are optimized to take a photo with the same focus—usually from a couple of feet to infinity. They use the same aperture opening and shutter speed for every single picture. That means anything too close will be out of focus. This is the type of focus you get with disposable cameras, because it's cheap and doesn't require any sort of adjustment on the user's end.

Autofocus cameras change the focus by using software and hardware adjustments. The biggest difference you'll notice as a user is that you can focus on things very near the camera lens, such as bar codes. It also means you'll have more out-of-focus pictures, since the autofocus might not always work quite as well as you'd hoped, but the overall picture quality will be better. Very few Android cameras come without autofocus. The HTC Tattoo is one of the few fixed-focus phones sold in the United States.

Zoom is another feature often listed on cameras. There are two types of zoom: optical and digital. Optical zooms use the camera's lens (the camera optics) to magnify part of the photo frame. You can still get a high-resolution photo from an optical zoom. Digital zoom is just a software solution in which the camera makes part of the picture look bigger. It's the illusion of zoom without adding any detail to the picture. When possible, it's best to ignore digital zoom and just stand closer to the subject of your photo or video. However, that's not always possible, and that's when digital zoom is useful.

0 0

Post a comment