12.12 Sale - M55 333mm Underwater Aspherical
Do you use an underwater housing with a M55 threaded port?
Then you should try this close-up lens from iDivesite. Its aspherical lens design reduces aberration and promises a sharper, clearer image.
Don't use a M55 thread? No problem. Simply use the AD-6755 step-down adaptor from iDivesite.