The crop factor is approximately 1,5 so the 85mm lens on you camera has an angle of view of view similar to what a 202,5mm lens would have on a "full frame" camera. The aperture of f/1,4 on APS-C equals aperture of f/2,1 on "full frame". (Just use the crop factor to multiply/divide the aperture when necessary when doing this kind of comparisons.)
Do you experience a crop factor with an APS-C camera even if you are using an APS-C lens? In this video, I compare the crop factor of a full-frame camera and
Well, the first answer is that the focal length on the 36×24 camera is double the focal length of the m4/3 camera (50mm vs 25mm) so the full frame camera requires more light to get the same exposure on its larger sensor. That’s why the virtual aperture is larger. This also helps us explain why we have f-stop numbers in the first place.
But, with a Canon 70D the focal length of the lens is multiplied with the crop factor (50×1.6), resulting in a focal length or angle of view of 80mm. If you would put a 35mm lens on the Canon 70D, you would roughly get a look of a 50mm on a full-frame camera.
Remember, the focal length given represents the result on a full frame body. Let’s take the example of a 50mm. It doesn’t matter if it was originally designed for APS-C or FF format, the focal length of a lens doesn’t change. It is the field of view that varies depending on the size of the sensor on which you place the lens.
PENTAX LENS FOCAL LENGTH CONVERSION CHART Full-frame >APS-C size. Using 1.5 crop factor. 6mm > 9mm / 38mm > 57mm / 70mm > 105mm 8mm > 12mm / 40mm > 60mm / 72mm > 108mm
That’s the crop factor for most APS-C cameras. 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). Bear in mind; this is just an approximation. Canon’s crop factor is actually about 1.6x, and most Nikon and Sony cameras are normally closer to 1.52x.
The implication is that if a full-frame lens is used on a camera with an APS-C sized sensor, only the middle portion of the image circle is used and the image will appear as if it has been made by a lens with a focal length that is 1.5x longer than the actual marked length. If an APS-C format lens is used on a full-frame camera it is incapable
The Difference Between Full Frame vs. APS-C. Full-frame and APS-C formats indicate the sensor's physical dimensions, entirely different from pixel count. A full-frame sensor has 36mm by 24mm in size based on the traditional 35mm film format. An APS-C sensor is 1.5 times smaller, 25.1mm by 16.7mm, and named after the Advanced Photo System type-C TigIDy.
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    • full frame vs aps c focal length