I use 2 different methods when using my iPhone for panoramas (or for images just requiring a slightly wider view like the featured image). The examples here are with my older iPhone 6 when I was in Florida in the Spring. The iPhone 6 had a 4.2mm lens which is equivalent to a Full Frame camera lens Field of View of 29mm. Many times you get a “curve” on the horizon and a distinct “Curve” and distortion on the ends when using the panorama feature on the iPhone 6. It really stands out if you are on a road that is straight left & right of your position and you are basically shooting a pano looking down the road to the left moving the phone down the road on the right. You get a distinct “bowing” look to the image as in the last photo in this post. Sometimes you can say it is an interesting effect, but not really ideal for the image. How close the objects are in the center has another set of problems because the far left & right are farther away and with a wide lens on the iPhone distortion looks more prominent.  Because of this sometimes I take 2 (or more) individual images with my iPhone and use Photoshop to blend them for a panorama (or just a slightly wider view than the standard 1 image). I do this instead of the Pano mode in the iPhone which tends to distort the horizon line. The featured image is just a little wider so the tree on the right is more in the image. With the new iPhone 11 Pro, I have 3 lenses so I can shoot much wider than the older iPhone with the 1.5mm lens (Full Frame Camera Equivalent is ~13mm). In the examples below I also used the “Warp” feature in Photoshop (Edit>Transform>Warp) to straighten out the horizon somewhat which also can get a slight curve to the horizon in the image. I also have my system setup to open jpegs from the iPhone in Adobe Camera Raw to have even more options in adjusting my files before I even open them in Photoshop. Doing it this way, I can adjust the settings of the jpeg file, sort of treating it like a faux “Raw” file. It seems to really work well with my new iPhone 11 Pro. But these examples are from the older iPhone 6.

2 Horizontal Images, stacked vertically for more clouds

iPhone 6 – 2 image pano Stack for a little more clouds

iPhone 6 – 2 image sunrise Pano for more width (Horizon Line Corrected somewhat in Photoshop)

iPhone 6 – 2 image sunrise panorama, with more overlapping of images, assembled in Photoshop. This give a little more on the left & right sides. Sometimes you lessen the “curve” arc of the pano mode by shooting 2 single images and blending them then using the “Pano” feature.

Panorama made with iPhone 6 showing “warping curve” distortion of railing on deck platform by just using the Pano feature on the phone. (Horizon line here was Corrected Somewhat in Photoshop)

iPhone 6 Panorama shot @ Blackwater NWR Wildlife Drive – Showing distortion of road (on left and right) by just using the pano feature while standing on the road.