aesop Posted October 20, 2010 Share #1 Posted October 20, 2010 Advertisement (gone after registration) ...quick question - what do the terms "Max Aperture Value" and "Shutter Speed Value" refer to? I just saw them whilst viewing some EXIF data and the resulting values don't make sense to me. Link to post Share on other sites More sharing options...
Advertisement Posted October 20, 2010 Posted October 20, 2010 Hi aesop, Take a look here EXIF data query. I'm sure you'll find what you were looking for!
jankap Posted October 20, 2010 Share #2 Posted October 20, 2010 In Photoshop I find as an example one camera parameter of my Dux-4: max aperture f/2. And extra: used aperture 2,8. Sigma Photo Pro only offers the actual data of the photo, no camera data. Does this help? Jan Link to post Share on other sites More sharing options...
mjh Posted October 20, 2010 Share #3 Posted October 20, 2010 MaxApertureValue ist the maximum lens aperture specified as an unsigned rational number. ShutterSpeedValue is the shutter speed specified as a signed rational number. Both are APEX values. The relationships between those APEX values and the more useful f-numbers or exposure times are: f-number = 2^(MaxApertureValue / 2) exposure time = 2^(–ShutterSpeedValue) Link to post Share on other sites More sharing options...
ho_co Posted October 21, 2010 Share #4 Posted October 21, 2010 Michael-- Please remind me once again: What is APEX? Link to post Share on other sites More sharing options...
mjh Posted October 21, 2010 Share #5 Posted October 21, 2010 APEX is short for “Additive System of Photographic Exposure” (see APEX system - Wikipedia, the free encyclopedia). APEX values for shutter speed, aperture, exposure, and ISO speed are all logarithmic so you can, for example, add the ApertureValue to the ShutterSpeedValue to give the ExposureValue – thus the “Additive” in “Additive System of Photographic Exposure”. Link to post Share on other sites More sharing options...
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