I have been doing some further testing with the Struman Optics Lens on my iPhone 11 Pro Max. There is such a narrow depth of field and focusing is by moving the camera to focus - a bit like nifty fifty. It is somewhat challenging re focus and camera shake.
The subject is an Australian native Fan Flower.
That's really impressive focusing when the slightest movement is so critical, Ethel. Very nicely done. Great details, shapes and textures which the use of b&w brings out beautifully.