So what in the world is a “crop sensor” anyway?
There are two kinds of sensors in DSLRs – full frame and crop.
Full-frame sensors are exactly the size of 35mm film (24mm X 36mm) Crop sensors are smaller and come in different sizes.
The reason that the sensor size is important is that it changes the way a lens behaves. To explain that, we first have to define a couple of things about lenses, specifically their focal length.
The focal length of DSLR lenses are spoken of in millimeters. You’ll hear about a 50mm lens, a 600mm lens, a 24mm lens and many others. That “mm” specification tells us how much the lens magnifies the scene we’re looking at.
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