I thought I'd link again to an Emil Pakarklis' video on using the iPhone camera.
I wanted to show the beautiful detail on my cup and saucer and found the tips on adjusting focus and exposure at the same time really helpful. Not quite got it - can't get both accurate colour (3rd photo) and the light shining on the gilding (4th) - but better than before..
The iPhone can do so much more than I realised and he explains it very well!
Enjoying watching the Chelsea Flower Show - especially the behind the scenes growers' trials and tribulations...