Lens Angle of View

Because the mirrorless cameras all have different sensor sizes, they also require different lenses to get the same angle of view from the same place. For example, if you and I were standing next to one another and I was using an m4/3 camera with a 150mm lens, if you were shooting with a Sony E-mount you would need a 200mm lens to get the same shot.

Angle of View
35mm (FE, L(S)) APS (EOS M, E, NX, XF, L(T)) m4/3 CX (Nikon 1)
104 degrees 14mm
10mm* 7mm 5mm*
84 degrees 20mm 14mm 10mm 7.5mm
74 degrees 24mm 16mm 12mm 9mm*
65 degrees 28mm 18mm 14mm 10mm
54 degrees 35mm 24mm 17mm 13mm
40 degrees 50mm 35mm 25mm 19mm
29 degrees 70mm 50mm 35mm 26mm
24 degrees 85mm 60mm 42mm 31mm
19 degrees 105mm 70mm 50mm 39mm
10 degrees 200mm 135mm 100mm 74mm
7 degrees 300mm 200mm 150mm 110mm
5 degrees 400mm 270mm 200mm 150mm
4 degrees 500mm 335mm 250mm 185mm
3.5 degrees 600mm 400mm 300mm 220mm

(Warning: some values have been rounded for convenience in this table; * indicates a focal length not currently available in a format).

Note that manufacturers do not tend to use horizontal angle of view in their specifications as I do here. Instead, camera makers use diagonal angle of view (angle across the diagonal of the capture area). That's not the way photographers think, though. Anyone can figure out what 90 degrees horizontal is (about an 18mm FX lens), but I don't many that can figure out how to apply 100 degree diagonal (also 18mm FX), especially when we have differing aspect ratios (3:2, 4:3, etc.). 

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