camera - How to set the focal length of the viewport to be 1000 mm? - Blender Stack Exchange
What is the ideal focal length for sculpture? — Blender.Today
Sady Fofana on Twitter: "made a quick focal length chart for some of u blender peeps (and 3d peeps in general) to show the difference between camera mm sizes #b3d #blender #b280 #
Object Data — Blender Manual
Focal Length - Basics & Interface - Blender Artists Community
Understanding the camera focal length - Lighting and Rendering - Blender Artists Community