Luke Mason Posted August 25, 2016 Share Posted August 25, 2016 Just now, Jn- said: I've taken the liberty of using this extract from an article in Photography Life, he explains it a lot better than I could ... I simply replaced sensor dimensions, which would be in millimetres i.e. 24x36 for FF with 4480x6720 and xx x yy for 2160 x 4096. https://photographylife.com/what-is-crop-factor "How Crop Factor is Calculated The math to derive the crop factor is quite simple. Knowing the physical size of the sensor, you first calculate the diagonal using Pythagorean Theorem (a² + b² = c²), then divide the number by the diagonal of the crop sensor." I personally don't have any problem if it is 1.64, all the better, since i've already ordered it, but using the diagonals of the FF sensor and the diagonal of the 4K crop it's 1.74. Yes that math only works assuming the aspect ratio is consistent, usually crop sensor is the same aspect ratio as FF sensor, all 3:2. Video crops differently. 1.64 is actually extremely close to a Super 35mm size, I guess Canon took this into account when designing this 30.4mp sensor. Quote Link to comment Share on other sites More sharing options...
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