Lens Compression
Lens compression is an optical effect that occurs when using longer focal lengths, where objects at varying distances appear closer together than they actually are in physical space. This happens because telephoto lenses have a narrower field of view, which compresses the spatial relationships in a scene. The effect is more pronounced with longer focal lengths—a 200mm lens produces more noticeable compression than an 85mm lens. This is a direct result of how longer focal lengths render perspective, flattening the depth cues that shorter lenses naturally convey.
Technical Basis
The compression effect is not a distortion but rather an inherent property of how different focal lengths sample a scene. When shooting with a longer lens from a greater distance to frame the same subject, the background and foreground elements appear squeezed together. This is because the narrower angle of view captures less information about the relative size differences between near and far objects. Conversely, wide-angle lenses exaggerate spatial separation, making objects appear farther apart than they are.
Practical Application in Panoramas
Panoramic photography can leverage lens compression by shooting multiple frames with a longer lens and stitching them together. This technique produces a wide-angle composition while retaining the spatial compression characteristic of telephoto focal lengths. The resulting image combines the broad field of view of a wide-angle photograph with the flattened perspective of a longer lens, creating a distinctive visual effect where the scene appears both expansive and compressed.
Source Notes
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