Olympus OM Zuiko Auto-W 21mm f/2

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An f/2 21 mm that weighs the same as most 50s: 11 elements in 9 groups with a floating group and 0.2 m close focus. Corners and vignetting are weak at f/2 and tidy up by f/4. One of the fast-wide halo lenses of the OM system and expensive today.

Key specs

Focal length

21 mm

Max aperture

f/2

Mount

Olympus OM

Image circle

Full frame

Close focus

0.2 m

Filter thread

55 mm

Weight

250 g

Field of view by sensor

Full frame

81.2° horizontal · frames like 21 mm on full frame

Super 35

61.3° horizontal · frames like 30.4 mm on full frame

Micro Four Thirds

44.8° horizontal · frames like 43.7 mm on full frame

What it goes on

OM has a 46 mm flange, so it adapts without glass to Canon EF as well as to every mirrorless mount. The aperture ring is at the front of the barrel and the focus ring behind it, the reverse of most stills lenses, which takes some getting used to with a follow focus.

• Canon EF camerasWith adapterALEXA 265, ALEXA 35, ALEXA Mini LF, Pocket Cinema Camera 6K G2 +14 more

  Fotodiox OM-EOS · Leitax OM-EOS. 2 mm of room; a plain ring works.

• Sony E camerasWith adapterRonin 4D-6K, Ronin 4D-8K, Alpha 1 II, Alpha 7 IV +13 more

  Novoflex · K&F Concept · Fotodiox. 28 mm of room — a plain mechanical adapter. Manual focus and iris.

• Canon RF camerasWith adapterEOS C400, EOS C50, EOS C70, EOS C80 +10 more

  Novoflex · K&F Concept · Fotodiox. 26 mm of room — a plain mechanical adapter. Manual focus and iris.

• L-Mount camerasWith adapterCinema Camera 6K, PYXIS 12K, PYXIS 6K, Ronin 4D-6K +6 more

  Novoflex · K&F Concept · Fotodiox. 26 mm of room — a plain mechanical adapter. Manual focus and iris.

• Micro Four Thirds camerasWith adapterMicro Studio Camera 4K G2, Pocket Cinema Camera 4K, Lumix BGH1, Lumix GH6 +1 more

  Novoflex · K&F Concept · Fotodiox. 26.8 mm of room — a plain mechanical adapter. Manual focus and iris.

• Nikon Z camerasWith adapterKOMODO-X 6K S35, V-RAPTOR [X] 8K VV, V-RAPTOR XE

  Novoflex · K&F Concept · Fotodiox. 30 mm of room — a plain mechanical adapter. Manual focus and iris.

• Leica M camerasWith adapter· by flange mathsALEXA 265, ALEXA 35, ALEXA Mini LF, Ronin 4D-6K +1 more

  18.2 mm of room for a plain ring. Check rear-element and mirror clearance before buying.

• LPL camerasWith adapter· by flange mathsALEXA 265, ALEXA 35, ALEXA Mini LF, URSA Cine 17K 65

  2 mm of room for a plain ring. Check rear-element and mirror clearance before buying.

See every camera this lens fits →

Sources: en.wikipedia.org, mu-43.com, phillipreeve.net