In the latest video of Framelines (, Josh Edgoose goes on a small tangent from the main topic: lenses should use the full-frame equivalent focal length, not the real focal length.

Why should the full-frame equivalent be the base reference? I understand the conventions and all that, but feels weird to put a focal that’s not the actual focal length, and, more important, it gives the sense that full-frame somehow is the “right one”, and the others orbit around it, which for me isn’t the case (all sensor sizes have their place, from tiny smartphone sensors to large format).

If it’s to get an universal measurement, then I’d rather jump head first to thinking in lenses in terms of field of view angle, and not focal length, something I’d loved lens makers displayed more prominently.