Using the Sea & Sea 46 Extension Ring with Focus Knob for MDXfrom Sea & Sea, you can operate manual focus with select Canon and Nikon wide-angle zoom lenses in ports on MDX series underwater camera housings. Check out the list below and see Canon MDX System Chart or Nikon MDX System Chart. A compatible FC focus gear is required for manual focusing, and can be used in conjunction with a zoom gear. This represents a significant improvement to the Sea & Sea product line, which previously only allowed for the use of auto focus with zoom gears.

The focus knob on the ring is located in a convenient position that makes it easily accessible via the index finger and thumb. Additionally, the extension ring is equipped with a port lock. An optional left grip extension lets you position the left housing grip forward to provide easier access to the extension ring's focus knob.

For Select Canon and Nikon Wide Lenses    For Use with Port on MDX Camera Housing    Allows Manual Focus Even with Zoom Gears

Works with the following lenses in ports on MDX series underwater camera housings:

Related Questions and Answers

Q: 1. Funcionan en un ys-d2

A: Este difusor es comptable con ambos YS-D2 y el YS-D2J

Q: 2. this is the only site that mentions batteries for this item - does it take them?

A: No, it uses natural daylight, and you, therefore, must keep your fingers clear of the small white aperture on top. You can try a small white led light with your other hand for use at night, as the compass is not normally visible without adequate overhead light.

Q: 3. Will this tray work with my Olympus PT-EP08 housing? I intend to utilize two (2) Sea & Sea YS-D1 strobes. Can you make a recommendation on the additional S&S arms, connectors, and accessories that I will require to complete my intended setup?

A: The Sea & Sea, Sea Arm 8 Camera Tray with Grip will work with the Olympus PT-EP08 Housing and one Sea & Sea YS-D1 strobe. Since you will be using two strobes get the Sea & Sea Sea Arm 8 Tray Set with Tray / Grip. Here is the link: a href= http://www.bhphotovideo.com/c/product/752909-REG/Sea_Sea_SS_SA8T_Sea_Arm_8_Tray.html target= _blank http://www.bhphotovideo.com/c/product/752909-REG/Sea_Sea_SS_SA8T_Sea_Arm_8_Tray.html/aIt is best to buy Sea & Sea, Sea Arm 8 SLR Set. This kit includes an 8.8 and 5.5 arm section. This will give you an arm that is long enough for wide-angle shooting. You could also bring the sections in close together for macro work. The Sea & Sea YS-D1 strobes include head adapters. But buying the Sea & Sea, Sea Arm 8 SLR Set is less expensive than buying the parts separately and not buying the head adapters. Here is the link: a href= http://www.bhphotovideo.com/c/product/733378-REG/Sea_Sea_SS_SA8SLR_Sea_Arm_8_SLR.html target= _blank http://www.bhphotovideo.com/c/product/733378-REG/Sea_Sea_SS_SA8SLR_Sea_Arm_8_SLR.html/a

Q: 4. Could this strobe be used with a Nikonos V?

A: The Sea & Sea YS-D3 Lightning Underwater Strobe is compatible with the Nikonos-V Underwater Camera. However, you must add the Sea & Sea Sync Cord (5-Pin) for YS Series Strobes to Nikonos Bulkhead. Here is the link: https://bhpho.to/3nv3X4q.

Q: 5. WICH ARE THE COMPATIBLE HOUSINGS?

A: The Sea & Sea 30205 Universal Dome Port 210 is compatible with Sea & Sea MDX Underwater Housings for DSLR and mirrorless cameras, with select wide-angle lenses attached. To see compatible lenses, required extensions, and gears, please consult the Sea & Sea port chart.

Q: 6. will this bag fit a 600mm prime lens?

A: While you do not list the specific brand/model of 600mm lens you own, I do not think it would fit in the above case. While the case itself is large enough to hold the lens, you would need to purchase one of the Core Units to protect and pad the lens inside the case. The largest DLSR Core Unit compatible with this case would be the Shimoda Designs Large DSLR Core Unit (Parisian Nights), B&H # SHCULDSLRPN, whose interior dimensions are 10.6 x 15.0 x 6.3". As most of the 600mm lenses we carry are around 18 inches in length, they would be too long to fit the Large DSLR Core Unit.

Q: 7. Does this work on YS-D2?

A: YEs these should work with your YS-D2.

Q: 8. Where is this made?

A: This light is made in Japan.

Q: 9. What core unit inserts are compatible with this backpack?

A: All core units for DSLR are compatible with the Shimoda Designs Explore 60 Backpack (Sea Pine). There are three options either 3 small DSLR core units, 1 small and 1 medium DSLR core unit stacked, or 1 large DLSR core unit.

Q: 10. Does this battery door o-ring, Sea & Sea SS-X-10066, fit the YS-27 and YS-30 strobes?

A: The Sea & Sea Battery Cap Silicone O-Ring is compatible with the Sea & Sea YS-30 TTL Underwater Strobe and the Sea & Sea YS-27DX Underwater Strobe.