Having a ring flash in you studio is really helpful when photographing small objects. Unfortunately, ring lights can cost a lot of money. We have seen a few different DIY versions on the MAKE blog before. You can save a lot of money by making a ring flash yourself. I especially like the use of an old toothpaste tube for enclosing the fiber optic tubing. Who knew it was so reflective inside?
This is a fibre-optic flash extension for your DSLR’s popup flash. Totally easy! Works great! Durable! Designed specifically for K20D with 100 2.8 DFA lens but adaptable to other lenses (see Tamron Adaptall 90 2.5 example at the end.) Build your own!