YSK: Your phone camera's aspect ratio is 4:3; setting it to anything else crops your photos
Why YSK: I've been seeing an increasing number of phone photos shared online in 9:16, 9:21 or similarly tall aspect ratios, often with parts of the subject cut off. I've asked a few people why they cropped their images that way, and none of them knew they were cropped.
This is true, and good to know but with caveats. If you take the picture in 16:9 mode then yes you're only using part of the sensor (or likely the whole sensor but only part of the image is being processed and stored), but you would also be using your phone's display to properly frame and take the picture how you want to. A good picture is not just the technical aspect of using the sensor.
The outcome when someone crops a 4:3 image after taking it to make it 16:9 etc depends on how the orignal image was framed and how good the skills are of the person cropping it. You may get more information if you take the picture in 4:3 mode but then you may find it much harder to convert it to a format you like (for example, a format that would fill the display when viewed on a phone, a TV or a computer display) due to how you framed the original photo. I'd argue it's better to take the photo in the format you want to consume it in if you're using a phone. If you have an actual dedicated camera, then get a camera that works best in the format you want to use.
Sure, pre-cropping is a valid technique, best done intentionally.
get a camera that works best in the format you want to use
Dedicated cameras intended for photography (rather than videography) almost exclusively come in either 4:3 or 3:2. Video cameras occasionally use 16:9, or even weirder ratios.
Nobody is telling you what to like, just how your phone camera functions.
Now if we’re doing photo critique, I might tell you a 9:16 portriat orientation photo of your cat with half its ear cropped out on the side but a whole bunch of the floor included in the foreground looks poorly composed, but cropping to 16:9 in some other context might exclude some uninteresting clutter and improve the photo.
I get it and I’ve always known. I just prefer 16:9 photos because… Well, my screen and monitors, and TV are 16:9 so why not take photos that (by default) fill the screens?
Nothing more annoying than showing an album to friends over Chromecast on your TV and the photos don’t fill the screen.
If that’s your preference, then that’s what you should do.
I’m seeing an increasing diversity in screen aspect ratios lately though, so it might be worth considering whether that’s the aspect ratio you want to use for a photo you’ll care about longer than your current display devices. If you shoot it uncropped, you can always create cropped copies later.
WRT diversity, my current laptop is 16:9. My next one will probably be 3:2. My main external display is 16:10, and the secondary is 9:16. My phone is 19.5:9. Media rarely fills the screen for me.
One issue with shooting uncropped is that the composition will most likely take advantage of the aspect ratio you are using and not necessarily crop well. Composing the shot in the aspect ratio that you intend to display it is actually a better technique unless you are very skilled and able to imagine how you’re going to crop it in the future.
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