Where can I buy Nikonos lenses?
There are usually some lenses on Ebay. The 15mm f/2.8 lens is widely accepted to have the best optics, but it is unfortunately also the most expensive. The 20mm lens is nearly as useful, and is often much less expensive than the 15mm. The 28mm is great for macro work and some fish portraits. None of these three lenses (the 15mm, the 20mm and the 28mm) can focus properly above water. The 35mm is the most useful amphibious lens that will work above water as well as below water. The 80mm is also amphibious, and is best used with an apochromatic close-up adapter for supermacro images that take advantage of the image stabilization built into the EP1 camera body.