Field of View in Full frame vs. Crop Sensor Cameras [Includes photo comparison]. When photographers are interested in buying a full frame camera for the first The 50mm lens on your A7III gives you 50mm of full-frame equivalent field of view. The 35mm lens on your A6000 gives you about 52.5mm of full-frame equivalent field of view because of the smaller sensor. And since it's an APS-C lens designed for the smaller sensor, when mounted to your A7III it cannot develop a projection of the scene that The factor relating the 50mm focal length of the normal full frame lens and the 31.3mm of the equivalent normal APS-C lens is often called the "crop factor", sometimes the "digital multiplier". It's 1.6x for Canon EOS DSLRs and 1.5x for Nikon, Pentax and Sony (who have very slightly larger APS-C sensors). It doesn't actually multiply the focal
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While it's a worthy optic on both full frame and APS-C bodies, it truly comes into its own when paired with the Canon EOS R50 or R100 – where, as the niftiest nifty fifty, it becomes an essential prime lens for everyday shooting, travel, street photography and video work. See our full Canon RF 28mm f/2.8 STM review This extends to the APS-C lenses that people often use with them. For those with smaller hands or who want a lighter option (especially if on the go), this may be preferred. Sony's Full Frame mirrorless cameras are a bit larger and heavier (although still quite lighter and more compact compared to DSLR options). Fuji’s medium format lenses, while delivering amazing image quality all just don’t have very large max. apertures. These modest max. apertures mean you already lose approx. 1-2 stops vs. full frame lenses of comparable focal lengths. To this you’ll need to add nearly another stop (vs. full frame) to achieve a comparable depth of field. To get the equivalent field of view of 50mm lens on a full frame camera, I need a 31.3mm lens when using an APS-C camera. It doesn't matter if you have a full frame lens or APS-C lens. For those that don't understand this last comment see this pic:
The crop factor of an APS-C sensor is, generally speaking, about 1.5. That means a FF sensor is 1.5 times wider and 1.5 times taller than an APS-C sensor. When you take a photo with a 50mm f/2 lens on a FF camera it has a certain field of view and a certain depth of field.
Full Frame Sensor vs APS-C Sensor. Full Frame (FE) = Sony A1, A7C, A9 II, A9, A7R IV, A7r III, A7S III, A7sII, A7III, Etc… APS-C (E) – Sony A6600, A6500, A6400, A6300, A6100, Etc… The Sony full frame sensor cameras and APS-C sensor sized cameras BOTH USE the same E-Mount, but the lenses are designed differently for the sensor coverage
Second, full frame cameras offer a greater dynamic range than APS-C cameras. While dynamic range is often hard to perceive, it manifests as the difference between the detailed whites and the detailed blacks in your photos. Full frame cameras are better able to render extreme tones in a scene. 3. Higher Resolution.

As you can see, when shooting at the same focal length on a full-frame vs. APS-C sensor, the frame area is significantly different. The viewing angle also changes on a crop sensor. Therefore it would be incorrect to say that the 50mm on APS-C is same as 75mm (50mm x 1.6 crop factor) on a FX camera.

Here's a table for the APS-C sensor in my Canon 30D (15mm x 22.5mm). To make one for your sensor, just find the diagonal using the Pythagorean method. Then calculate focal length FOV as a factor of your diagonal. Then find the 35mm full-frame focal lengths that most closely match those factors.
The Focal Length of our lens is simply always what it says it is (zoom of course changes it to what zoom says it is.) The focal length choice is selected for the sensor size, but the physical lens cannot be modified by the sensor size present. A 50 mm f/1.8 lens on a full frame body is still the same 50 mm f/1.8 if on any smaller cropped body.
Not all sensors are created equal, and the overall image quality is heavily affected by the sensor technology as well. So, if you compare the image quality of a full-frame camera from 10 years ago to a modern APS-C under similar low light conditions, you probably won’t find any differences, and the APS-C image might be a little bit better too. 2ePc.
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