Hi gtg1921,
welcome to the Apple (user-to-user) Community!
Wondering if this Apple support article may be helpful: iPhone camera basics - Apple Support
Eg: says:
Zoom in or out
- On all models, open Camera and pinch the screen to zoom in or out.
- On iPhone models with Dual and Triple camera systems, toggle between 0.5x, 1x, 2x, 2.5x, and 3x to quickly zoom in or out (depending on your model). For a more precise zoom, touch and hold the zoom controls, then drag the slider right or left.
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To zoom in or out (eg: when editing) on a Photo is different, as you can zoom right in to see pixels in some apps.
Also: Accessibility settings can allow for zoom in and out on many other things while viewed on the iPhone screen.
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We don't seem to have a lot of precise info. about the workings of features of the new iPhone 15's camera yet.
Shopping help would likely know the most at this stage.
All the. best :-)