I wanted to try close-up photography, but didn't want to buy a dedicated macro lens (although Panaleica 45mm is nice, it's also quite expensive). I solved this dilemma by buying an achromatic close-up filter - Kenko AC Close-Up No. 3. This thing is Japanese through and through Its box and manual don't have a single word in English. This is how it looks like: The filter apparently is coated and shows deep violet reflections. And this is the first shot I've made with this filter paired with Canon FDn 50mm f/1.8 lens: Full size: http://photo.torba.com/images/pavel.urusov/f/365eJ44etYWZ9wRbXhrz.jpg It's only very slightly cropped. Image quality is VERY decent, I can't find a hint of chromatic aberration (Canon 50/1.8 shows some strong spherochromatism, but it's ok). Sharpness is excellent.