New to the site, but been a rock lover for ages. I don't know if this has been posted before, but my Main reason for this post is that I have seen a lot of terrible macro shots of rocks. All you need are a loupe and smart phone. Just put the lens against you camera lens and hold close to your subject adjust your distance for focus and shoot. Simple. I'm going to try post a few shots using 15x and 10x lenses.