What lens data should I enter in Hugin for a Sony DSC-T100?
Asked 10/29/2013
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I’m stitching a panorama in Hugin from photos taken with a Sony DSC-T100. Hugin asks for lens data, including the focal length multiplier/crop factor, and I’m not sure how to determine it from the camera specs or EXIF. The camera’s lens is listed as 5.8–29mm, equivalent to 35–175mm in 35mm terms. What value should I enter, and how is it calculated?
Originally by Photography Stack Exchange contributor. Source · Licensed CC BY-SA 4.0
Photography Stack Exchange contributor
12y ago
2 Answers
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If you use 6.03 for the Focal length multiplier field you should be good to go. The Sony PowerShot DSC T-100 lists the 5.8-29mm focal length as 35 equivalent to 35-175mm. This figures out to 6.035, but the 1/2.5" sensor of your camera is in a 4:3 ratio instead of the standard 35mm 3:2 ratio. The diagonal of a standard 35mm film frame divided by the 7.18mm diagonal of the Sony's sensor yields a value of 6.02.
Originally by user15871. Source · Licensed CC BY-SA 4.0
user15871
12y ago
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Generated from our catalog & community — verify before relying on it.
For the Sony DSC-T100, enter a focal length multiplier (crop factor) of about 6.03.
Why: the camera’s actual focal length is listed as 5.8–29mm, and its 35mm-equivalent range is 35–175mm. Dividing the equivalent focal length by the actual focal length gives the multiplier:
- 35 ÷ 5.8 ≈ 6.03
- 175 ÷ 29 ≈ 6.03
So 6.03 is the right value to use.
This also agrees closely with a calculation based on sensor size: a 1/2.5" sensor has a diagonal of about 7.18mm, and a full-frame 35mm image has a diagonal of about 43.3mm. Dividing 43.3 by 7.18 gives about 6.02, essentially the same result.
If Hugin reads the actual focal length from EXIF, you typically only need to supply the crop factor/multiplier correctly. For this camera, 6.03 is a good practical entry.
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