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.If you get out your ruler and measure it, you will find it is less than 400mm. Go to the second section, "35mm full-frame equivalents", and input a focal length of 50 mm and an f-stop of 4. This means a 400mm lens should be 400mm long.Now the calculator is an APS-C focal length calculator. Modern electronically controlled interchangeable lenses, such as those used for SLR cameras, have f-stops specified internally in 18 -stop increments, so the cameras' 13 -stop settings are approximated by the nearest 18 -stop setting in the lens. 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. The first thing to do is to select your camera's sensor size from the list of sensor sizes.
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