Aloha All, I have a Macromate close-up lens that I will be putting on ebay unless anyone here wants it. I originally used it on the older Ikelite housing with the clear port for a Canon 100mm macro. It worked great. When I moved up to the new black ports I had to grind the “U” shape out of the extension to fit the part where the two pieces come together. You can see this in the photos. So this will work on the old clear port for the 100mm or the black glass port. The following is from Backscatters website about this product…….
Get incredibly sharp 2:1 (twice life-size) macro images with the underwater removable MacroMate lens for underwater SLR housings. The MacroMate doubles your 100mm or 105mm image size by allowing you to get closer to the subject.
Sealed Achromatic Glass Optics
Custom achromatic lenses are sealed in a glass optical housing and provide extreme magnification with incredibly sharp edges. This unique design produces much tighter and sharper images than simple close-up lenses that are exposed to water. The air sealed chamber maximizes the optical properties of the close-up lens without distortion or soft edges.
The MacroMate is designed for a snug fit on the lens and when not in use, the photographer can quickly flip the lens up and out of the way. This is just the Macromate close-up lens. The port is NOT included.
Optics: Multi-coated acromatic lenses sealed in an optical glass housing
Magnification: 2:1 (2x lifesize)
Hardware: Custom machined delrin adapter with stainless fasteners
Weight in Air: 1.55 lb / 24.8 oz (most designs)
Weight in Fresh Water: 0.56 lb / 9 oz (most designs)”
You can see more about this on the Backscatter website. They sell them for $599.00. The first person with $300.00 plus $15.00 shipping will get this one. Let me know if you have any questions.