The Recent F/stop Controversy

Started 1 month ago | Discussions thread
Michael Fryd
Michael Fryd Forum Pro • Posts: 11,240
Re: The Recent F/stop Controversy

kiwi2 wrote:

Michael Fryd wrote;

I would say that for digital photographers the actual aperture diameter is more important than the ratio of focal length to diameter.


Consider a digital photographer shooting raw and a film photographer.

Both have a camera/lens combination with a 40° angle of view.

Both have settings that result in an aperture diameter of 12.5mm.

Both have a shutter speed of 1/60 second.

Both are shooting the same subject, from the same spot, at the same time.

The digital photographer has no need to know the sensor size, focal length, or ISO value.  He can set the camera on AUTO-ISO and get a great result.

The film photographer doesn't have this option.  He needs to make sure that the intermediate step of light per unit area on the sensor falls into a specific range.

The digital photographer only needs to worry about total light.  The digital photographer gets essentially the same results independent of sensor size. Therefore the digital photographer does not need to be concerned (or even aware of) the ratio of focal length to aperture diameter.

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