Snakepottery Posted April 3, 2010 Share #1 Posted April 3, 2010 Advertisement (gone after registration) How does the camera know what f stop you have set? It is shown in the exif data, but as there is no coupling between the aperture ring and the camera electronics, how does it know exactly? Coded lens and non coded. I'm sure it's obvious when someone says! Just thinking about it whilst cleaning my teeth this morning!! Sad eh Andy Link to post Share on other sites More sharing options...
Advertisement Posted April 3, 2010 Posted April 3, 2010 Hi Snakepottery, Take a look here A daft question, probably!. I'm sure you'll find what you were looking for!
andybarton Posted April 3, 2010 Share #2 Posted April 3, 2010 It doesn't. It guesses. (I'm getting a sense of deja vu here...) http://www.l-camera-forum.com/leica-forum/leica-m8-forum/121102-wrong-aperture-exif-picture-my-new.html PS - You will get a better response to a question if you put in the subject line what the question is about Link to post Share on other sites More sharing options...
stunsworth Posted April 3, 2010 Share #3 Posted April 3, 2010 There's a small sensor on the front of the camera next to the viewfinder window. The camera compares the light level read by this sensor and that from the meter. Since the meter is affected by the aperture setting but the sensor isn't, this can be used to calculate the approximate stop. Link to post Share on other sites More sharing options...
Snakepottery Posted April 3, 2010 Author Share #4 Posted April 3, 2010 Ahhh, all is clear now! I wondered what that window was for. Rather clever really! Thanks gents Good point Andy, In future I will. Link to post Share on other sites More sharing options...
zeitz Posted April 3, 2010 Share #5 Posted April 3, 2010 The window/sensor is also used by the flash system. Link to post Share on other sites More sharing options...
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