One of my favourite tools for astrophotography is the Canon EF 50mm F/1.8 lens which I use for wide field deep sky images. It's the single cheapest lens on the market, as evidenced by its all-plastic construction and the scratchy grinding noise made by its autofocus motor. But it's also fast, small and light, and it performs way above its price range. It's the perfect accessory for an astronomer on a budget, like me. Unfortunately, kids and photography gear don't mix, as I found one day when I came home one day to find it broken on the floor.