Quote Originally Posted by Daniel Browning


A 6mm iris diameter on S3 digicam has the same angle of view, focus distance, light gathering power, depth of field, and diffraction as a 6mm iris diameter on fourth thirds, as well as 6mm iris diameter on APS-C, FF35, Medium Format, and even Large Format.


It all comes down to iris diameter.
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I think I'm missing a line or few between some dots. how does the iris diameter determine the angle of view? I thought that was a combination of the focal length and the sensor size... Same lostness on the focus distance....


Did you mean that given the same angle of view and focus distance, a 6mm iris has the same light gathering power, depth of field, and diffraction, regardless of the sensor format, or do I need a rewind on something?