Nauticam has introduced the Midrange Focus Optimizer 3 (MFO-3). It helps underwater photographers focus closely using macro lenses. The MFO-3 can make 90mm, 100mm, and 105mm lenses act like a 60mm lens. It’s great for taking photos of tiny sea creatures in blackwater photography. The MFO-3’s price is $730 and is lighter than similar models.