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Author Topic: iwitness calibration erroneous focal length?  (Read 2992 times)

flightfollowing

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iwitness calibration erroneous focal length?
« on: April 20, 2013, 10:04:10 PM »
I am trying to import an iwitness calibration into photoscan and lens, but getting unusual values.
Attached is the calibration report from iwitness, and the pixels are 17um and the camera is 640 x 512 yielding a sensor size of 10.88 x 8.704
However, when I convert, I get an impossible focal length?

Alexey Pasumansky

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Re: iwitness calibration erroneous focal length?
« Reply #1 on: April 21, 2013, 02:54:42 PM »
Hello flightfollowing,

Could you please chek you are entering correcy values for Photosite width/height - they are pixel size (0.0017mm) and not the width/height of the sensor.
Best regards,
Alexey Pasumansky,
AgiSoft LLC

flightfollowing

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Re: iwitness calibration erroneous focal length?
« Reply #2 on: April 21, 2013, 04:23:53 PM »
Alex,

That was it, Thanks! it was actually 0.017 for a pixel size. If you update the help section for lens, you might toss in a screenshot of example numbers to help users and cut down questions.

Thanks again for the fast solution.