Bed Frame Queen Instamatic Provides Your Bed with Perfect Support. The Mantua bed frame queen instamatic has extremely durable features, including a 1.5-inch angle iron construction that cradles your bed's foundation so it does not shift. A double angle support beam runs down the middle to prevent sagging.
Quora User, Digital photography since 2003... Optical zoom is a variable focal length lens, like a 15-85mm or 25-200mm lens. In an APS-C sensor DSLR camera, the standard or prime focal length is 35mm. Any focal length lower than this is called wide angle range. All the focal lengths above 35mm are called tele photo range.
A zoom lens is one where the photographer can vary the focal length within a pre-defined range, whereas this cannot be changed with a prime or fixed focal length lens. The primary advantage of a zoom lens is that it is easier to achieve a variety of compositions or perspectives (since lens changes are not necessary).