Does focal length change perspective if camera-to-subject distance stays the same?
Asked 12/1/2016
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2 answers
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If I photograph a subject from the same position and at the same distance, but use two different focal lengths, will the subject’s proportions and perspective change?
Example:
- Shot A: 25mm lens, subject 5 meters away
- Shot B: 50mm lens, subject also 5 meters away
If I then crop or resize the 50mm image so the subject appears the same size as in the 25mm image, and ignore image quality, distortion, depth of field, and resizing artifacts, will the two images have the same perspective?
I’m asking because I want to create composites. If the subject is photographed in the studio from the same camera position and distance as it would appear in the final scene, does that mean focal length itself doesn’t matter for matching perspective, as long as distance is the same?
Originally by Photography Stack Exchange contributor. Source · Licensed CC BY-SA 4.0
Photography Stack Exchange contributor
9y ago
2 Answers
4
Your perspective will be the same in both photos. Perspective is dependent on distance alone.
With two photos taken from the same distance, after you crop the image to match the subject size, there will be virtually no difference in the final image.
Originally by user39427. Source · Licensed CC BY-SA 4.0
user39427
9y ago
0
Generated from our catalog & community — verify before relying on it.
Yes. If the camera stays in the same place, perspective stays the same.
Perspective is determined by camera position relative to the subject and the rest of the scene—not by focal length. A different focal length only changes field of view and magnification. So if you shoot from the same distance and then crop or resize one image to match the other, the subject’s proportions and spatial relationships will be essentially identical.
For compositing, the key factor is matching camera position/distance (and angle) to the subject and scene. If those match, focal length by itself does not change perspective.
What focal length does affect is how much of the scene is included. In practice, lenses can also differ in distortion and other rendering characteristics, but if you ignore those as you stated, the perspective result is the same.
So your understanding is basically correct: for matching perspective in a composite, distance and camera viewpoint matter; focal length mainly determines framing.
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