Raspberry pi v2 camera matrix

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Hi all,

I am working on Raspberry pi camera v2 (8Mp) & I want to extract its parameters (camera matrix/intrinsics matrix). This is what I got after running OpenCV camera calibration on 46 pics (3280x2464). Mean error ~ 3.96 pixels [ 2.6831990884818483e+003 0. 1.6412238399388559e+003 0. 2.4927854385005239e+003 1.2143470505633950e+003 0. 0. 1.]

I noticed that Fx & Fy is not the same. Is it logical ? Has anyone done this before ? Could you please share your result for comparison ?

Thanks, Nove.