What Exposure Actually Means, in Plain Words
Okay. We spent the last lesson tapping on faces to set focus. Now we need to talk about the thing that tap is also doing without you realizing it, which is exposure.
Here's the thing. Exposure just means how light or dark your photo comes out. That's it. It's not a mysterious camera word. When you tap on something to focus on it, your phone is also looking at that spot and deciding how bright or dark to make the whole picture based on what's there. That's why sometimes you tap on a face and the background goes dark, or you tap on a bright window and the person's face goes almost black. The phone is guessing, based on where you tapped, and it doesn't always guess right.
I think this is the part that trips people up most, more than the grid, more than the light stuff we did early on. Because it feels random. It isn't random. It's just responding to wherever you point it.
Try this at home
Pick something with both a bright part and a dark part in the same shot. A lamp on a table works, or a window with a chair next to it. Anything with contrast.
Tap on the bright part. Watch what happens to the rest of the photo. It'll probably go dark and murky.
Now tap on the dark part instead. Watch the bright part blow out, go white, lose all its detail.
Same subject, same light in the room, two totally different photos, just because of where your finger landed. That's exposure. You're not choosing a mode or a setting. You're choosing a spot, and the phone is building the whole photo around that spot.
Why this matters for what you're actually shooting
I ran into this hard when I was cataloging a stack of fabric I'd bought as deadstock, mill ends and seconds, stuff nobody was going to buy at full price so I got it cheap. I wanted photos of each piece so I could actually remember what I had instead of digging through a bin every time.
I tapped on the pattern to get it sharp, which is what I'd trained myself to do by then, and the fabric came out too dark every single time. The white background behind it was tricking the phone into underexposing the actual fabric. I probably reshot fifteen pieces before I figured out I needed to tap on the fabric itself, not near it, not on the background, right on the print, to get the exposure to sit where I wanted it.
And I'll be honest, I noticed something kind of funny partway through. I was being more careful with two-dollar-a-yard mill ends than I generally am when I'm trying to get a decent photo of my own family. Reshooting, adjusting, checking the screen. For fabric. That's a little embarrassing but it's also exactly the point. The care isn't really about what you're shooting. It's about paying attention. Once you're paying attention, you get better photos of everything, fabric and people both.
The slider you might not know is there
On most phones, when you tap to focus, a little sun icon shows up next to where you tapped. If you slide your finger up or down near it, you can brighten or darken the shot by hand, on top of whatever the phone already decided.
This is worth knowing because you don't have to accept the phone's first guess. Tap where you want focus, then drag that little sun up if it's too dark, down if it's too bright. It takes some fumbling the first few times. Your thumb will slide the wrong direction. That's normal.
My opinion here, stated plainly
I'd rather you learn to read a scene and adjust by hand than lean on portrait mode or some automatic fix to smooth it over. The automatic stuff guesses for you, and its guesses are average at best. Tapping and dragging that exposure slider yourself takes ten extra seconds and gets you a photo that actually looks like what you were looking at. It's not fancy. It's just paying attention one tap at a time.
No real safety concern in this lesson, which is nice for a change. Just your patience, and maybe your thumb's aim.
Before next time: find one backlit thing in your house, a window with something in front of it, and practice tapping on different spots until you can get both the bright and dark parts to look decent in the same shot.