From ultra wide to regular and vice versa, it's like a toggle - it just switches between the two cameras. It's similar on the A7 (2018) minus the 1-tree-to-telephoto for lack of such a cam. The icon with 3 trees means ultra wide-angle cam, 2 trees denote the regular camera, and 1 tree means the telephoto. The camera app is very much the same as on any current Samsung, only with more icons in the viewfinder to control which camera is being used. This one has no autofocus, nor does it absolutely need it at this focal length. Now, that technically corresponds to a ridiculous 12mm equivalent, but the EXIF data reports 18mm, and in reality we think it's something in between. Then there's the ultra-wide module on top - an 8MP sensor behind an f/2.4 aperture lens that delivers a 120-degree field of view. This is actually the only telephoto camera on a Samsung midranger as of now.
Next up is the telephoto camera which uses a 10MP sensor coupled with an f/2.4 lens that delivers the field of view of a 52mm lens in 35mm camera terms, EXIF data says. It's got a more-than-necessary 25MP resolution sensor behind a fast f/1.7 lens with a focal length that's reported as 27mm. The primary cam is the second module from the bottom, right above the depth module. There's the 'primary' one flanked by an ultra-wide angle and a telephoto on each side (in terms of focal length, that is, not an actual arrangement). The other three modules, on the other hand, are self-sufficient and form the trifecta of cameras you want to have on your smartphone. Anyway, this depth camera uses a 5MP sensor with an f/2.2 aperture lens - for the sake of thoroughness, not that it really matters. Naturally, it begs the question 'why bother' when there are two other cameras to use for that. One of these cameras isn't a standalone module that you can take actual pictures with - instead, it's a 'Depth Camera', to be used for 'Live Focus', in Samsung's own terms. More importantly though, the A9 was the first handset with 4 cameras on its back - a feat in which it still remains unmatched. At the time of announcement in October, the Galaxy A9 (2018) was one of select few smartphones to pack 5 cameras total - it was this and the LG V40, essentially.
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