Over exposure

Started Jan 24, 2014 | Discussions thread
IanML Senior Member • Posts: 1,653
Re: Over exposure

Here's another way, which can help show the effect of incorrect exposure, and give a measure of it. It works with my a33, so it should with your a55:

First select P mode and note the shutter and aperture settings the camera chooses. Now select M mode and alter the settings to get them to the same values they were in P mode. If you are still on the same scene, the numbered scale to the right of the aperture setting should have a triangular cursor over the zero.

Now alter the shutter speed. A slower value will produce over-exposure - the cursor will move towards the positive side of the scale, and the live view picture will get brighter. A faster value will produce under-exposure - the cursor will move towards the negative side of the scale, and the live view picture will get darker.  Each click of the wheel will move the cursor 1/3 of a stop, three clicks will move it a complete stop.

To complete the demonstration, repeat by moving the aperture instead of the shutter setting.  A larger aperture (smaller f number) will produce over-exposure....etc

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Ian

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