Over on my blog I've written a review of the Sonia Close-up kit. The kit includes a set of +1, +2, +4, and +10 diopter lenses that allow you to get close-up and macro photos with almost any lens. The Sonia close-up kit is available quite cheaply on eBay, so is it any good?

You can read the full article with example photos over on my blog: Sonia Close-up Kit Review, but to sum up, the lower diopter value lenses are quite reasonable. The higher diopter lenses are quite bad though, especially the +10 lens, which blurs everything except the centre of the image.