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In April 2014, Google revamped its Android camera app. In the settings menu under "Advanced", there is just one option: Manual exposure. It defaults to off, but after turning in it on, I can't find any actual controls to manually adjust exposure parameters. I doubt my phone's camera module actually has a physically variable aperture, but I expected to see some way to adjust shutter speed and ISO — or at least to set an exposure value. But I don't see anything. How do I use this new feature?

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up vote 9 down vote accepted

Sadly, the feature's name is misleading. In fact, I'd go so far as to say that it's wrong, if not an outright lie. Turning this option on just enables you to use exposure compensation — it doesn't let you do anything actually "manual".

If you enable this option, the ... menu at the lower right of the screen gains a +/- icon, as typically indicates exposure value compensation. Selecting this allows you to choose compensation on a scale from -2 to +2. Exposure is still entirely automatic, and even with a value selected here will change automatically as lighting in the frame changes. You can't use this to get a constant exposure from shot to shot, or set based on external metering, or anything else you would want to use actual manual exposure for.

I don't understand why this is mislabeled, and I also don't understand why EV compensation isn't available by default. I guess it protects against newbies ruining their images by leaving it on accidentally, but there is an obvious indicator when a compensation value is selected, and EV compensation (with the same icon!) is common on pretty much all cameras at all price ranges. So, it's a mystery. And also something I'm reporting as a bug.


Note that the above applies to the Android 4.4 "Kit Kat" camera. The upcoming "L" update of Android is rumored to provide an API capable of real manual control, although it remains to be seen whether the stock camera app will take advantage of that.

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