Why no 40mm pancake (or similar)?

Started Feb 9, 2018 | Questions thread
Astrotripper Veteran Member • Posts: 6,809
Mount specs probably
15

I don't know too much about optics design, but here's a little trend that might explain that.

Mount / Flange distance / Pancake lenses

MFT / 19.25 mm / 14, 17, 20 mm

EF-M / 18 mm / 22 mm

EF / 44 mm / 40 mm

EF-S / 44 mm / 24 mm

Sony E / 18 mm / 16, 20 mm

Leica M / 27.8 mm / 28, 35 mm

Pentax K / 45.4 mm / 21, 40, 43 mm

Nikon F / 45.5 mm / 28, 45, 50 mm

Do you see the trend? There are no pancake lenses that have significantly longer focal length than the flange distance of the mount they are designed for. That's probably not a coincidence.

Obviously I omitted collapsible lenses that are only pancakes when collapsed.

So if you are hoping for a pancake short telephoto, I'm afraid you're out of luck.

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