11 hours ago
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Re: What is mFT FoV?
In reply to gollywop,
5 months ago
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gollywop wrote:
If one has, say, a 12mm lens on an mFT camera, it presumably implies some FoV. However, these days a large number of mFT lenses do software correction for lens distortions, and the image as rendered in, say, ACR is significantly different from the uncorrected version of the same image.
My question: is the 12mm FoV relevant to the FoV of the original image or the FoV of the corrected image, which is, typically, significantly smaller than that of the original?
The diagonal FoV in the official specs is the one you get after correction. This follows from the fact that the FoV specs for MFT lenses are the same as for other lenses with the same EFL (e.g., 84 degrees for the 12/2) as well as from the formula for calculating diagonal FoV based on the FL for a rectilinear lens described here.
The FL and the horizontal and vertical FoVs are the same before and after correction. Geometric distortion implies a departure from strict rectilinearity that affects the diagonal FoV only.
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