The Canon EOS M6 Mark II, a mirrorless interchangeable-lens camera, features an APS-C sensor. The true crop factor of the Canon M6 Mark II is 1.6x. This value, also known as the format factor or focal length multiplier, is derived from the ratio of a 35mm full-frame film diagonal to the diagonal of the digital sensor [1].

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The sensor in the Canon M6 Mark II measures 22.3mm in width and 14.9mm in height, resulting in a total imaging area of 332.27 mm² [7] [8]. The diagonal of this sensor is approximately 26.82mm [7]. The crop factor is calculated using the formula:

$\mathrm{\text{Crop Factor}}=\frac{\mathrm{\text{Diagonal of 35mm Full-Frame Film}}}{\mathrm{\text{Diagonal of Digital Sensor}}}$

Given that the diagonal of a 35mm full-frame film is 43.27mm [7], the calculation for the Canon M6 Mark II's crop factor is:

$\mathrm{\text{Crop Factor}}=\frac{43.27\mathrm{\text{mm}}}{26.82\mathrm{\text{mm}}}\approx 1.61$ [7]

This 1.6x crop factor means that a lens mounted on the Canon M6 Mark II will provide a narrower angle of view and a deeper depth of field compared to the same focal length lens on a full-frame camera [1]. To determine the equivalent focal length on a full-frame system, the actual focal length of the lens is multiplied by the crop factor. For example, a 31mm lens on the M6 Mark II will yield an angle of view and depth of field similar to a 50mm lens on a full-frame camera (31mm * 1.6 = 49.6mm, rounded to 50mm) [1].

The 32.5-megapixel APS-C CMOS sensor (with a total pixel count of 34.4 megapixels) in the M6 Mark II is considered state-of-the-art for APS-C cameras, offering high image quality and impressive autofocus performance [3] [5] [6]. This sensor is also found in Canon's EOS 90D DSLR [4] [6]. The camera's Dual Pixel CMOS AF system, which uses every pixel on the sensor for phase detection, contributes to its effective autofocus capabilities, including eye detection [3] [5] [6].

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