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Matching lenses from each maker's lineup, plus some classic medium and large format lenses. Email me if something is wrong or missing.
Interactive side-by-side simulation at the same subject size: see how 85mm and 200mm change camera distance, perspective, depth of field and background blur.
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Matching lenses from each maker's lineup, plus some classic medium and large format lenses. Email me if something is wrong or missing.
Both images show the same portrait at the same size. For the same head size, the 200mm camera stands about 2.4 times farther back than the 85mm camera. From closer in, 85mm shows more of the room around the person. 200mm has a narrower field of view, so the background looks larger and closer and is easier to simplify.
Start at f/2.8 on the left and f/2.8 on the right. Then try f/2.8 vs f/2.8, or open both to f/1.2 and f/2.8. Match depth of field sets the right-hand aperture so the background is as blurred as on the left. Both cameras use the same sensor, so equal f-numbers give a similar depth of field.
At the face framing, 85mm stands 136 cm from the subject. At f/2.8 the sharp zone runs from 133 cm to 139 cm. 200mm stands 3.2 m away, and at f/2.8 the sharp zone runs from 3.2 m to 3.2 m.
In the face framing, 85mm stands 136 cm from the subject and 200mm stands 3.2 m. For the same head size, the 200mm camera stands about 2.4 times farther back than the 85mm camera.
At the same framing, a distant background blurs in proportion to the aperture opening, focal length divided by f-number. 85mm at f/2.8 opens 30.4 mm and 200mm at f/2.8 opens 71.4 mm, so 200mm blurs it about 2.4 times as much. Close behind the person, the focal length matters less and the f-number more.
Compression comes from camera distance, not from the focal length itself. For the same framing, 200mm stands about 2.4 times farther back than 85mm, so the background looks larger and closer behind the person and less of it fits in the frame.
Also see: depth of field, bokeh, crop factor, lens compression.