Wide Angle Lenses: 5 Fast Facts

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Fact #1. Early in the advent of photography, in the first few decades of the 19th century, cameras utilized a single lens to bend light toward the negatives or positives of the day. That design was quickly found to be insufficient. The manner in which a convex lens bends light makes it very difficult to focus an image across a flat plane.
Fact #2. Recently, a new design has been patented by the folks at Sony, made available by the more pliable materials with which manufacturers can make camera sensors. Essentially, they solved the problem of catching curved light waves with a flat surface by curving the surface itself.
Fact #3. Camera lenses have guts. Lots of them, more often than not, and a fair amount of those guts are made of glass. It may make you wonder: why so much glass? Well, a lens can be used to direct, magnify, or to focus light. It takes a combination of magnification, direction, and focus to allow a desired photographic object to appear on a camera sensor as sharply as it does to the naked eye.
Fact #4. While Crop Factor might sound like the name of a competitive farming reality show, it's actually a way of understanding how much of the focal length your lens claims will actually make it into your image. If you mount any lens built for a 35 millimeter film camera on a modern full frame DSLR, you don't have to worry about crop factor..
Fact #5. Higher end lenses are more expensive. They often start with a wider front element for maximum light collection, which improves the camera's ability to see in low light. Optical glass can cost around 2,000 dollars per kilogram. A good lens can weigh upwards of 5 kilograms, most of which is plastic and lightweight metal. So, you can see how these things get pricey fast.