The way that DoF is defined (via circles of confusion), means that viewing distance, and the size of the final image, affects how DoF is perceived.An important note there – DoF is defined via circles of confusion, which is specified for a certain print size, at specific distance. It is on this that everything that you need to know about DoF, hinges upon. The concept of “circles of confusion” is an important one. Our friends at Cambridge In Color have written one of the clearest explanations on DoF that I’ve ever read. And yes, then it will give you the same perspective as a 150mm / 160mm lens on a full-frame body when shooting at that new further distance. If you put a 100mm lens on a full-frame body, and a 100mm lens on a crop body, and you want the same size for your subject in the frame, then you are going to have to move much further back to get the same image size with the crop sensor camera. With a zoom, the perspective does not change – you are merely enlarging the image. This distinction becomes an important point. You can not “zoom with your feet”, because if you change your position, your perspective changes.So on that note, if you are one of those who say things like “give it some bokeh”, then you need to stop. Two things which seemingly are the same, but aren’t. The image above certainly has nice, smooth bokeh. Shallow depth of field is NOT the same as bokeh.Yes, a 100mm lens on a crop-sensor camera will give you the same perspective as a 150mm / 160mm lens (on a full-frame camera), if you don’t change position … however, the DoF increases.īefore we can go much further, we need to recap on Depth-of-Field: Yes, a 50mm lens does indeed behave like an equivalent focal length of a 75mm lens (on a 1.5x crop sensor), or an 80mm lens (on a 1.6x crop sensor) for the same composition … however, the depth-of-field increases by about a stop. Just to save the impatient people some work. Since this article ended up being a long meandering discussion, I thought it best that we start with the final summary. In other words, whether your 50mm lens becomes “equivalent to” a 75mm or 80mm lens when used on a crop-sensor camera. And we’ll analyze whether there is actually an equivalency between certain focal lengths, when using a crop-sensor camera vs a full-frame camera. With this article, I want to help analyze what happens when you change lenses between a full-frame camera and a crop-sensor camera.
And that there is no “equivalent focal length” when you go to a crop sensor camera.īut what really happens is more complex than that. The focal length doesn’t change – you just get less of the scene. One argument goes along the lines that the crop sensor is just that, a crop. And that’s because the topic is a complex one … and therefore the answer is (kinda) complex as well.
The discussion (which tend to devolve into arguments) are convincingly made for both sides. The answers given on the photography forums are confusing – yes, the focal length effectively increases. No, it doesn’t. Two answers that are polar opposites. Whether a 50mm lens on a crop-sensor acts like a 75mm lens (on a 1.5x crop sensor) or 80mm lens (on a 1.6x crop sensor). When the differences between full-frame and crop-sensor cameras are discussed, there is an inevitable question about whether the crop sensor multiplies the focal length. Full-frame vs Crop-sensor comparison : Depth-of-field & Perspective
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