FS7: Canon 18-80 on FS7

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Angle of View and F-Stop

Angle of View and F-Stop

I never said I only shoot at f/1.4 or f/2.8, of course I often shoot stopped down. This was not the point. Point is the 18-80mm lens gives exact same image DOF-wise as an 2/3" ENG camera. That's it. You can still use other faster lenses on your FS7 if you want DOF unachievable on ENG camera at given field of view.



Wrong. This shows that you simply don't understand it. It is a simple matter of physics. Here is a great DOF and Field Of View calculator, you can use it to to calculate equivalent FOV and DOF for different formats. I hope it opens your eyes: https://www.pointsinfocus.com/tools/depth-of-field-and-equivalent-lens-calculator/#{"c":[{"f":11,"av":"4","fl":50,"d":3048}],"m":0}

That depth of field tool is really informative.

A headshot in 2/3" format at f1.7 and a headshot in Super 35 format at f4.5, shot at approximately equal subject distances and angles of view, each show depth of field of just under 2".

2/3" sensor, f1.7, headshot at 22 Degree Angle of View (22.1mm):
https://www.pointsinfocus.com/tools/depth-of-field-and-equivalent-lens-calculator/#{"c":[{"f":3,"av":"1.7","fl":22.1,"d":1006,"cm":"0"}],"m":0}

Super 35 sensor, f4.5, headshot at 22 Degree Angle of View (60mm):
https://www.pointsinfocus.com/tools/depth-of-field-and-equivalent-lens-calculator/#{"c":[{"f":11,"av":"4.5","fl":60,"d":963,"cm":"0"}],"m":0}

This is not to say that the shots would look identical. Even the appearance of the out-of-focus areas may be different with respect to texture or bokeh, depending on the lenses used. These calculations are based on F-stops, which are derived from the ratio of the size of the lens opening to the lens focal length; using T-stop values (light transmission) is less accurate for calculation depth-of-field.