There is hardly a person who has not asked the question: 'What is HDR in an iPhone camera?'. Indeed, the function is rarely used anywhere, little is written about it, but this does not make it less useful. The point is that it automatically, in a short period of time, focuses on different objects in the frame, thanks to which the picture as a whole acquires a balance – everything is equally lit and in focus, and the detail is also increased.
However, despite such obvious advantages, the regime also has disadvantages. The most obvious of these is the inability to photograph moving objects. In HDR mode, the camera takes multiple shots and therefore everything must be still for the picture to be detailed.
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The second minus is that you won't be able to make a bright shot. Thanks to HDR, the picture takes on the average value of the brightness of all elements to increase the detail.
Another drawback is the photo time. Since in this mode the camera takes several pictures (three or more), it takes more time to save and process the frame.
From all that has been said, the obvious conclusion suggests itself – it is better to use the HDR mode when you need to photograph a landscape, monument or other object that will not get away from you.