![]() So the aperture f-stop to get the same depth of field would need to be f/2.6. To calculate the f-stop needed it does 4 / 1.53 = 2.61 = f/2.6.The calculator will then do the calculation 50 / 1.53 = 32.68 = 33 mm, meaning you would need a lens with a focal length of 33 mm, so the image is equivalent to one formed with a 50 mm full-frame lens.Go to the second section, "35mm full-frame equivalents", and input a focal length of 50 mm and an f-stop of 4.Now the calculator is an APS-C focal length calculator. Select the Sony APS-C crop factor with a value of 1.53x from the list of sensor sizes.You have an APS-C camera with a crop factor of 1.53x (a super 35 crop factor), and you want to buy a lens that will give the same image as a 50mm f/4 full-frame lens. Let's look at a common problem when choosing lenses for crop sensor cameras. The calculator will apply the crop factor and tell you the focal length and f-stop in terms of 35mm full-frame equivalents.Īs with most Omni calculators, it also works backward. You can then input the focal length of your camera's lens and the aperture f-stop you are interested in using. An example image will appear when you do this, showing how much smaller or larger your sensor is compared to the standard full-frame sensor. ![]() Canon APS-C cameras have a crop factor of 1.6x and Olympus who use a ‘four thirds’ system have a crop of 2x.The first thing to do is to select your camera's sensor size from the list of sensor sizes. This means a 200mm lens has an effective field of view of a 300mm lens. Nikon DLSR APS-C cameras have a crop factor of 1.5x. To calculate the effective field of view of APS-C cameras, multiply the focal length of the lens by the crop factor.įujifilm X mount cameras have a crop factor of 1.55x, this means my 100-400mm lens has an effective field of view of 155mm to 620mm. However, some manufacturer’s dedicated APS-C lenses will not physically mount. If not you will get a very obvious lens vignette around the edges. You may still be able to use a lens designed for a APS-C camera on a full frame camera if you can set up the sensor to only use the smaller image area. So say if you had an 85mm f/1.8 lens on a full frame body, on a 1.5x crop body the lens would be about 127mm f/2.8, resulting in a less blurry background since youd have to step back with a crop. Lenses which are designed for cropped sensors are physically smaller than their 35mm equivalents because they require a more narrow channel for the light to pass through. In terms of aperture and bokeh, I know that theres about a stop difference between a full frame camera and a crop sensor camera with the same lens. Note, it isn’t exactly to scale, just an approximate illustration. The green and red represents the differences in the fields of view between a 35mm sensor and APS-C. It is much like looking at something through two different sized windows. An APS-C sensor is physically smaller so the field of view is smaller than that of a camera with a full frame sensor. What changes is the effective field of view seen by the camera sensor. Optically a 300mm lens will always be a 300mm lens regardless of whether it is made for cameras with a cropped sensor or full frame. Most importantly it doesn’t physically increase the focal length of a lens.
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