Digital zoom is just a software effect that throws out pixels. Most photographers prefer to crop the full image later in editing. Accidentally triggering pinch-to-zoom, and then losing pixels, would be very annoying.

This assumption is reenforced by the focal length indications on the focus dial, where for example 77 mm (Telephoto) is indicated at 3x.

Despite the indication of focal lengths on the zoom ring, suggesting that the values correspond to selection of one of the phone's three physical lenses, the numbers just indicate the zoom factor that will be used, possibly by selecting the corresponding lens, but also possibly through digital cropping. As a user, you have no control over how the zoom level is accomplished, you simply have to trust Apple AI.

The buttons indicate the default zoom for each of the attached cameras. Here is my iPhone 11 Pro with the 0.5 / 1 / 2 controls visible. For me they select the lens and I confirmed this by mounting my camera on a tripod and taking three photos with the native app and three photos with Halide app and comparing the photo metadata.

If you swipe your finger between them and watch carefully, you can see the digital / sensor zoom transition from the default view and then slide in the new camera image as you reach each point.

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The lens chosen will be selected to obtain the best photograph. In some lighting situations, the photo quality from cropping the 1x lens to 3x will be higher than the quality from the 3x lens.

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Apr 12, 2014 — TFoV = 57.3 deg/radian x 25/1000 = 1.43 degrees. You can also roughly estimate the AFoV of an eyepiece from the field stop and the focal length ...

The 81 series is the more popular of the two, it is available in varying strengths - 81A, 81B and 81C. A is the lightest, B is medium, and C is the strongest.

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I'm confused about what the 0.5x, 1x, 3x buttons do in the Camera app on my iPhone 13 Pro. I had assumed that they were how I specified which lens I was using (what Apple misleadingly calls optical zoom) — i.e., they were how I selected the Ultra Wide, Wide, and Telephoto lenses, respectively.

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If you want selection of one of these values to work as you might expect (based for example on Apple's own UX and documentation) you will in fact need to use a different camera app, many of which adopt a philosophy more targeted at photographers:

The way you could categorize the systems are endo and exoatmospheric. Exoatmospheric is satellite to satellite communication. Very useful, very ...