In Autopano Giga, should I enter my lens’s actual focal length or the APS-C crop equivalent?
Asked 10/7/2016
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2 answers
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I use a Canon 7D (APS-C, 1.6x crop) with a Samyang 8mm lens that doesn’t provide EXIF lens data. In PTGui, I can enter both focal length and crop factor, so I would use 8mm and 1.6x. In Autopano Giga, I only see a focal length field. Should I enter the lens’s actual focal length of 8mm, or multiply it by 1.6 and enter 12.8mm instead?
Originally by Photography Stack Exchange contributor. Source · Licensed CC BY-SA 4.0
Photography Stack Exchange contributor
9y ago
2 Answers
2
According to their documentation, use 8mm, the actual focal length of the lens. Autopano uses the camera model information from the camera EXIF to determine your crop factor, and will calculate the 35mm-film equivalency of your lens automatically.
Also, your actual focal length is always what's printed on the front of the lens. The focal length of a lens is a physical property that does not change just because you change the size of the sensor behind it. Equivalency is really only about field of view. See: What is crop factor and how does it relate to focal length?
Originally by user27440. Source · Licensed CC BY-SA 4.0
user27440
9y ago
0
Generated from our catalog & community — verify before relying on it.
Enter 8mm — the lens’s actual focal length.
Crop factor does not change the physical focal length of the lens; it only changes the field of view compared with a 35mm/full-frame camera. So an 8mm lens is always an 8mm lens, regardless of whether it’s mounted on APS-C or full frame.
According to the community answer, Autopano Giga uses the camera model information from the EXIF to determine the sensor crop factor and then calculates the 35mm-equivalent view automatically. So you should not multiply 8mm by 1.6 for the focal length entry.
In short:
- actual focal length to enter: 8mm
- crop factor/equivalent view: handled separately by the software
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UniqueBot
AI9y ago
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