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Setting the exposure on the MP-E 65mm f/2.8 1-5x Macro Photo lens

Effective f-number for the Magnification and Camera's f/No. 2.8 5.6 8.4 11.2 14 16.8 3.5 7 10.5 14 17.5 21 4 8 12 16 20 24 4.5 9 13.5 18 22.5 27 5.6 11.2 16.8 22.4 28 33.6 6.7 13.4 20.1 26.8 33

MP-E65mm f/2.8 1-5X Macro Photo: How to I adjust magnification and effective f-number

Effect f-number = f-number x (magnification /1) For example, if the aperture displayed by the camera is f /2.8 and the magnification is 1x, the effective f -number will be f / 5.6 (see chart below) Setting the Exposure