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Comparisons

23mm APS-C vs 17mm Micro Four Thirds

23mm APS-C and 17mm Micro Four Thirds frame practically the same. The shapes differ: 23mm APS-C is 3:2, 17mm Micro Four Thirds is 4:3.

Reference photo: Forest
A 23mm APS-C
B 17mm Micro Four Thirds
The scene as framed by 23mm APS-C
A What 23mm APS-C sees
The scene as framed by 17mm Micro Four Thirds
B What 17mm Micro Four Thirds sees

The numbers

A 23mm on APS-CB 17mm on Micro Four Thirds
Focal length23mm17mm
Full-frame equivalent34.5mm34mm
Horizontal54.1°53.9°
Vertical37.5°41.8°
Diagonal63°65°
SensorAPS-C 23.5 × 15.6 mmMicro Four Thirds 17.3 × 13 mm
Crop factor×1.5×2
Aspect ratio3:24:3

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