Imaging recource: When does it make sense to choose an f/4 lens over an f/2.8 lens?

Photographer Thomas Heaton's latest video opens up an interesting discussion about lens selection and prime lenses versus zoom lenses. The Zeiss Distagon 21mm f/2.8 has long been an important part of Heaton's gear bag, but after he purchased a Canon 24-70mm f/2.8 lens, he found that he wasn't using the Zeiss lens anymore because it wasn't worth switching lenses for the extra three millimeters of focal length. What about when he wants a significantly wider focal length though? Enter Thomas Heaton's newest lens, the Canon 16-35mm...
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