Can't achieve the same exposure as auto mode IN manual mode?? help!

Started Apr 25, 2013 | Questions thread
Tom_N Forum Pro • Posts: 14,449
Re: Can't achieve the same exposure as auto mode IN manual mode?? help!

Limburger wrote:

Don't replicate the settings just expose correctly.

Have a look at the other settings as metering as well.

You say you were in car with sunset and streetlight on, so the environmental light was changing all the time, could be your camera metered light for exposure and then when you took the shot the scene was darker. May have been the same in the initial shooting.

Perhaps, also, one of more of the (shutter speed, aperture, ISO) controls are continuously variable when the camera sets them.

That is, a camera might offer shutter speeds of Bulb, 1/8, 1/15, 1/30, 1/60, 1/125, 1/250, 1/500, 1/1000, 1/2000, and 1/4000.  Those are the ones the camera UI lets you select in S/Tv or M mode.  But if you were in Av mode and the camera calculates that the shutter speed best suited for the the (light + aperture + ISO) was 1/400, the camera might use a shutter speed of 1/400.

If it did, you'd be left either with

(a) A displayed ("LCD/EXIF") shutter speed that was impossible to select manually, or

(b) A displayed ("LCD/EXIF") shutter speed that had been "rounded" up or down to a speed that the camera's UI would let you select.

Either way, when you went to Manual and tried to take a second picture with the "same" exposure, you would be altering the shutter setting – because 1/400 isn't a directly-selectable speed.

Just a thought.

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