What is the actual focal length and sensor size of the Lytro Illum?
Asked 6/3/2014
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Lytro lists the Illum as having a 30-250mm equivalent zoom with a constant f/2.0 aperture. What are the lens’s actual focal length values, and what sensor size does that imply?
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Photography Stack Exchange contributor
12y ago
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The Lytro Illum’s actual lens focal length is about 9.5-77.8mm. Since Lytro’s quoted 30-250mm range is a 35mm-equivalent figure, that implies a crop factor of roughly 3.1 to 3.2 (30 ÷ 9.5 and 250 ÷ 77.8 are both about 3.2). That points to a sensor around the 1-inch class.
So in short:
- Actual focal length: 9.5-77.8mm
- 35mm-equivalent focal length: 30-250mm
- Implied sensor size: approximately 1-inch type
As usual, “equivalent focal length” is used for comparing angle of view to a full-frame 35mm camera; the physical focal length of the lens remains 9.5-77.8mm.
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