by Bart Arondson

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If you know the actual focal length and can include the effective focal length of the lens in your model, you can calculate its crop factor, and estimate its size. Taking my own camera as an example (it's what I know), I know I have a 50mm lens that is effectively a 75mm lens. For most camera phones you can search for these specifications online. With this ...


If you consider geometrical lenses, it is not possible to get sensor dimensions and focal length as an object only determines a certain angle and from that information you can only determine the sensor size/focal length ratio. E.g. you don't know which of the purple, orange or cyan case is inside the camera, and you get the very same picture. You can try ...


Take a newspaper, and shoot it from a normal reading distance, starting from an exposure that results in only traces of the letters over paper rendered bright white and all the way down to the paper rendered black. Bring the shots to computer, open them so that the scale is 1:1 and see the range of exposures where you can read the articles, including small ...


You can do what DxO and others do - make test photos and analyze the result. Dynamic Range can be measured using the test chart displaying a range of fields of known brightness. imatest is one of applications that automate the process (see: but this is all maths and image processing and could be performed "by hand" by a ...


I think the simple answer here is "you can't". "Dynamic range" isn't a concept with a simple definition, so unless you can get numbers from DxOMark as you've quoted for the NEX-5R and RX100, then you can't compare them. As an example of this, compare DPReview's test of the Sony a6000 where their tests give a dynamic range of 8 2/3 EV for the A6000 (the green ...

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