I was just looking at some digital image properties, and it did not seem to make sense.

Shutter Speed: 1/16 sec.
Exposure Time: 1/11 sec.
Lens Aperture: F/1
F-Number: 2.8

I would have thought that shutter speed would be equivalent to exposure time and lens aperture to f-number. What am I missing?

  • \$\begingroup\$ What camera model was used? \$\endgroup\$
    – Michael C
    Commented Jan 3, 2016 at 10:35
  • \$\begingroup\$ Camera is Moultrie MFH-DGS-M80. \$\endgroup\$
    – mcu
    Commented Jan 3, 2016 at 12:54

1 Answer 1


That is quite common in EXIF data but the values are usually closer. It is possible the EXIF data for that photo is telling us a lens with a maximum aperture of f/1.0 was used at f/2.8 and the shutter speed was set to 1/16 and that resulted in an actual exposure time of 1/11.

Here is an example where the shutter speed and aperture selected were 1/500 and f/1.8 but the actual shutter speed value and aperture value were 1/512 and f/1.76

enter image description here


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