Serene Life

by garik

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How do I calculate the aperture size and area You divide the focal length by the aperture/F-stop value. Infact, that's what the F-stop/aperture value is. It's a divider. Sometimes written as ƒ2.8 (as an example) but a lot of people leave out the vinculum and should be written as ƒ/2.8. Replace the ƒ with the focal length and that's the diameter of the ...


Your lens is a 35/2.8, but that doesn't mean the aperture is necessarily f/2.8. Just that f/2.8 is the widest it can be opened. The f-number is the focal length divided by the aperture diameter: f_number = focal_length / diameter So, solving for the diameter: diameter = focal_length/f_number. So, in this case your diameter is 35mm/2.8 = 12.5mm. If the ...


The aperture size is a property of the lens only and does not depend on the crop factor. It does depend, however, on the actual focal length of the lens (not the "equivalent" focal length). So you need to obtain the actual focal length by dividing by the crop factor. You can then calculate the size (diameter) of the aperture (strictly speaking the size of ...

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