Although the iPhone has many features to offer, it lacks one particularly handy tool, a zoom lens for its camera.
App Store now has a zoom facility, which is used by moving a slider on the screen to the desired magnification and touch the camera picture. You can position the slider along any border of the screen, and photos save to your photo album.
Camera Zoom works like other digital zooms, basically by blowing up just a portion of the picture you see in the viewfinder. That does mean that the more you zoom, the worse the picture gets. Your shots will get a noisy grain and slightly distorted colors as you approach maximum magnification. That noise becomes more pronounced in lower-light photos.
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