Eye of the eclipse...

by darkhausen

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Hopefully you are aware of the relationship between the three main controls that affect exposure: Aperture, Shutter speed and ISO. In this case you've set an aperture of F/2. You have left the decision of shutter speed and ISO to the camera (by selecting Aperture Priority mode, and having Auto ISO on). It's a low light scene, so the camera doesn't have ...


In each of the 4 photos, the amount of sky and foreground has changed. The sky is very bright and everything else is much darker. This makes for a very challenging exposure for any camera. The camera metering had to decide between the light and dark areas and come up with a guess as to what the correct exposure should be. Your camera actually did a very ...


The second and subsequent pictures should be darker. You increased the aperture size by 1 1/3 stops from f/22 to f/14 but reduced the shutter speed by 1 2/3 stops from 1/60 to 1/200. So the second picture should be 1/3 stop darker than the first. How did this happen when you only changed the aperture and the camera automatically changed the shutter speed? ...


Exposure value, EV, is log2(Fnumber^2/Time_in_secs). That is, if the aperture is set to f/2, the Fnumber is 2; and suppose time is set to 8 secs, log2(2^2/8) = -1 EV. Closing the aperture by 1 stop, that is increasing the Fnumber by sqrt(2), we are getting Fnumber = 2.8. Decreasing the shutter speed to compensate, also by 1 stop, we are getting 16 secs, and ...

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