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85mm vs 105mm portrait comparison
Interactive side-by-side simulation at the same subject size: see how 85mm and 105mm change camera distance, perspective, depth of field and background blur.
What this comparison shows
Both images show the same portrait at the same size. For the same head size, the 105mm camera stands about 1.2 times farther back than the 85mm camera. From closer in, 85mm shows more of the room around the person. 105mm has a narrower field of view, so the background looks larger and closer and is easier to simplify.
Start at f/1.4 on the left and f/1.4 on the right. Then try f/1.4 vs f/1.4, or open both to f/1.2 and f/1.4. 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/1.4 the sharp zone runs from 135 cm to 138 cm. 105mm stands 168 cm away, and at f/1.4 the sharp zone runs from 167 cm to 170 cm.
Questions
How far from the subject do you stand with 85mm and 105mm?
In the face framing, 85mm stands 136 cm from the subject and 105mm stands 168 cm. For the same head size, the 105mm camera stands about 1.2 times farther back than the 85mm camera.
Which blurs the background more, 85mm or 105mm?
At the same framing, a distant background blurs in proportion to the aperture opening, focal length divided by f-number. 85mm at f/1.4 opens 60.7 mm and 105mm at f/1.4 opens 75.0 mm, so 105mm blurs it about 1.2 times as much. Close behind the person, the focal length matters less and the f-number more.
Does 105mm compress the background compared with 85mm?
Compression comes from camera distance, not from the focal length itself. For the same framing, 105mm stands about 1.2 times farther back than 85mm, so the background looks larger and closer behind the person and less of it fits in the frame.
Related comparisons
- 35mm vs 85mm portrait comparison
- 40mm vs 85mm portrait comparison
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- 50mm vs 105mm portrait comparison
- 58mm vs 85mm portrait comparison
- 58mm vs 105mm portrait comparison
Also see: depth of field, bokeh, crop factor, lens compression.