Hi guys. I would love to learn to shoot macro properly. I used to use a bridge camera and close up filter. However, I purchased an Olympus OM-D E-M10 Mkiii and treated myself to my first proper macro lens the Olympus 60mm f/2.8. I am looking for advice on any good books out there to buy for macro but also what sort of flash to get for macro? I don't want to spend more than around £50 on a flash at the moment however. Thanks in advance