Myths About Cropped Sensors (Two Photographs)
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The myths about cropped sensors are almost as subtle as this squirrel’s expressions. The way those selling cameras describe it you would think that a 100mm lens on 1.5 cropped sensor DSLR would be equivalent to 150mm lens on a full frame camera in every aspect. However only the angle of view changes not the magnification. The magnification remains that of a 100mm lens. The angle of view is the width of the view you get, telephoto lenses have narrow views and wide-angle lens, just as the name says ,have wider angles of view. There is an illusion of magnification but the lens is still 100mm and that illusion would disappear if you saw the same photo taken with a true 150mm lens at an equivalent aperture (which also changes with the size of the sensor). You hear that cropped sensors have deeper depth of field at any given aperture. In fact you need to multiply the aperture by the crop factor, a F2.8 lens is actually F4.2, it may also be a factor in letting in less light than on full frame camera with a larger sensor. A good selling point for full frame sensors may be that they are better performers in low light. I shoot only cropped sensors so the issue here is not that cropped sensors are bad, but that some of the advertising is a little too subtle.