https://www.the-digital-picture.com/Reviews/Sigma-17-50mm-f-2.8-EX-DC-OS-HSM-Lens-Review.aspx
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What is the holy trinity of lenses?
The lens trinity is a set of three zoom lenses that cover a wide range of focal lengths, from wide-angle to telephoto.
Typically, the lens trinity consists of a 16-35mm f/2.8, a 24-70mm f/2.8, and a 70-200mm f/2.8 lens.
These lenses are designed to deliver high image quality, fast autofocus, and low light performance.

