![]() ![]() The wide angle lens on your iPhone has an actual focal length of 3.99mm this gives it a full frame equivalent focal length of about 28mm given the tiny size of the sensor. Phone cameras have a crop factor of about 7x. The aperture of a S35 camera has a diagonal of around 31mm, but an Alexa 16:9 sensor has a. It can get complicated by the different frame sizes of what people refer to as S35. For standard 16mm, with a diagonal of 12.7mm, the crop factor is 43.3/12.7 3.41x. If you’re curious about the exact crop factor of your camera, look up its specs online. A Super 16 frame has a diagonal of 14.6mm, so the crop factor is 43.3/14.6 2.97x. Canon’s crop factor is actually about 1.6x, and most Nikon and Sony cameras are normally closer to 1.52x. It means that a 50mm lens on a crop sensor camera has an equivalent field of view to a 75mm lens on a full frame camera (50mm x 1.5 75mm). Because the image sensors in many digital cameras are smaller than the 24 mm × 36 mm image area of full-frame 35 mm cameras. That’s the crop factor for most APS-C cameras. The image sensor format of a digital camera determines the angle of view of a particular lens when used with a particular sensor. Bear in mind this is just an approximation. In digital photography, the image sensor format is the shape and size of the image sensor. ![]() It means that a 50mm lens on a crop sensor camera has an equivalent field of view to a 75mm lens on a full frame camera (50mm x 1.5 = 75mm). That’s the crop factor for most APS-C cameras. The most common crop factor you’ll encounter is 1.5x. The AoV of a 16 mm lens on a 1.6x crop camera is 80.40 deg. For example, the diagonal angle of view of a 16 mm lens on a full frame camera is 107.03 degrees. The sensor however is operating at its fullest capacity, and is not cropped. Fortunately, the maths has already been done for us, so you can put your pencil away. That actual meaning of this 1.6 crop factor is only that your 55-250 mm lens on the cropped sensor body has the same field of view as a camera with full sensor would see with a 88-400 mm lens (because its sensor is larger, seeing a wider view, so needing a 1.6x longer lens to reduce the full frame field of view back to what the smaller sensor. The 200mm EF lens is a cropped lens when used on a T3i. A new, full-frame camera comes with a hefty price tag of about 3000. There is a technical differences between a 75/85mm lens and a 50mm lens, and if the sensor-to-subject distance is the same, and the image of the crop-sensor is cropped to be equal to a 75mm, I would think. Another difference worth considering is the cost. So, if you use a full frame and a crop sensor to take images from an identical distance, with the same lens and point of view, the latter will produce a tighter FoV. Since photography is based around incredibly well understood and predictable optical principles, we can calculate the relative field of view for any combination of lens and sensor size when compared to a full frame camera. The smaller sensor’s FoV is a crop of the full frame. ![]()
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