Subsee +5 and +10ReefNet’s SubSee Magnifier is a high-quality close-up lens specifically designed for underwater photographers and videographers. It may be used on its own or mounted in a SubSee Adapter for maximum convenience. Its features include:

Large Diameter: A 52 mm diameter lens offers a wide field of view compatible even with full-frame DSLR cameras (36 mm x 24 mm sensors).

Multiple Power Options: Available in either +5 or +10 diopter versions. Choose the power best-suited to your style of photography, or get both for the most flexibility. The +10 version can increase your camera lens’ magnification by up to 3.5x!

Sealed, Multi-element, Coated Optics: Because SubSee’s optics are air-sealed, they retain full power underwater. Multiple lens elements (either 2 or 4 depending on strength) virtually eliminate pincushion distortion and chromatic aberration. Furthermore, anti-reflective coatings on all lens surfaces increase image brightness.

Standard 67 mm Mounting Thread: The SubSee Magnifier offers an industry-standard 67 mm thread. Screws directly onto many underwater housing ports!

Optional Handle / Lanyard Mount: These accessories allow hand-held use. Ideal for marine life enthusiasts.

http://reefnet.ca/products/subsee/