Actual Aperture on Sigma DP Merrill cameras

Hardy Steiner wrote:

Some comments on the recently announced Panasonic lenses point to a very interesting article which explains why the aperture values are not the same on CSC, crop size, full frame, medium format ... this brings me to the question:

The aperture of f2.8 on the Sigma DP Merrill cameras, what aperture would this be on a full frame camera?

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Best regards,
Hardy
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