When I used the Lumia 1020 as my phone, an app called Magnifier let me zoom in a lot closer than the limited macro capability of an otherwise great camera would allow. It worked like a video stream, pause it and it takes a pic you could then work with. Great for reading small print on electronic/pill bottles.
Well, that's now an Accessibility option in iOS 10!
•iOS 10’s built in magnifying glass http://www.loopinsight.com/2016/07/25/ios-10s-built-in-magnifying-glass/