Tap to focus- Yes, the iPhone does auto-focus, but what if you just can't get it to focus where you want? Often times, I use it to adjust where it's adjusting for the light. Photo too dark? Tap on an area of the photo that's particularly bright. Too bright? Just the opposite. Need to focus on a something far away or particularly close? Simply tap on it and the iPhone will adjust the focus on it.
Grid- When you have the camera opened on your iPhone, under "Options" you'll see the choice to turn on a grid. This can help you make sure your horizon line is straight or that the walls in your photo aren't distractingly lopsided. It's also used for what art students refer to as the "rule of thirds." The idea is pretty simple- a piece of art is more interesting to the eye if the main contents of the photo are in fact NOT centered, but rather slightly off-center. Look at the example below. The man is laying along the bottom line and the upper limit of the items in the yard is along the top line.
HDR- The other option in the "Options" section is HDR. HDR stands for "high dynamic range," but don't worry if you forget that shortly- I doubt anyone will quiz you on this. What HDR does is take three photos right after another. One is over-exposed (too bright), one under-exposed (too dark) and one is normal. Then, the iPhone lays the photos over each other and the result is a photo that shows more detail in areas that would otherwise be too dark or too bright to see them in. See the photo below as an example.
Practical Tip of the Day:
Tired of just missing the perfect moment? You can actually hold down the camera icon, adjust the position of the camera as you'd like and then let up on the icon. The iPhone won't actually take the photo until your finger comes up from the icon.
I do not know the purpose of these line or frame in iPhone camera but now I really understood that why this feature is present in the camera.
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