By designing a dedicated mold, Sea&Sea has been able to incorporate a meniscus lens design in the UDP dome construction, which reduces the spherical aberration and beam waste.
Therefore, the refractive power changes gradually from the center of the port to the peripheral area, allowing the different radii of curvature to create a clearer focus at the peripheral areas compared to that of conventional ports.

By using the highest optical grade PMMA material, the UDP 210 ARII has a refractive index close to glass allowing high degree of light transmission. In addition, Sea&Sea has achieved a 7-layer Anti Reflective (AR) coating to reduce internal reflection and the effects of decreased contrast.

Comparison of lens reflection 1
Comparison of lens reflection 2

The port has also been designed with usability in mind, as the dome can be replaced quickly and easily on the spot in any environment. In addition, the dome is also supplied with an additional bayonet mount, that can be simply attached with the six existing screws to provide compatibility with all 3rd party Nauticam housings.

*Compatible with all lenses listed on the port system chart when the port combination follows the UDP 210 AR.

Specifications
Size: Maximum diameter 250 mm x depth 104 mm. Dome Diameter 210mm
Weight: 1,310g (2.88 lbs)
Depth Rating: 100 M (328 ft)
Body Material: Corrosion-resistant aluminum alloy (anodized, internal anti-reflection coating)
Hood: ABS resin
Dome Material: Special optical PMMA

By designing a dedicated mold, Sea&Sea has been able to incorporate a meniscus lens design in the dome construction, which reduces the spherical aberration and beam.
Therefore, the refractive power changes gradually from the center of the port to the peripheral area, allowing the different radii of curvature to create a clearer focus at the peripheral areas compared to that of conventional ports. The new UDP 210 will no replace the discontinued Fisheye dome 240 #30116
By using the highest optical grade PMMA material, the UDP 210 has a refractive index close to glass allowing high degree of light transmission.

The port has also been designed with usability in mind, as the dome can be replaced quickly and easily on the spot in any environment. In addition, the dome is also supplied with an additional bayonet mount, that can be simply attached with the six existing screws to provide compatibility with all 3rd party Nauticam housings.

*Compatible with all lenses listed on the port system chart, when the port combination conforms to the Fisheye Dome 240.

Specifications
Size: Maximum diameter 250 mm x depth 104 mm. Dome Diameter 210mm
Weight: 1,310g (2.88 lbs)
Depth Rating: 100 M (328 ft)
Body Material: Corrosion-resistant aluminum alloy (anodized, internal anti-reflection coating)
Hood: ABS resin
Dome Material: Special optical PMMA

System Sample(100M)

Sample Photos (taken by Takuya Nakamura)

100mm in diameter. The most compact and lightweight optical dome port SEA&SEA offers.
Designed exclusively for fisheye lenses.


Optical Dome Port ll 100 S (#30133) (made-to-order item)
Designed exclusively for Nikon AF DX Fisheye Nikkor ED 10.5mm F2.8G

Optical Dome Port ll 100 M (#30134)
Designed exclusively for Tokina AT-X 107 DX Fisheye 10-17mm F3.5-4.5, for Nikon and Canon cameras.

Optical Dome Port ll 100 L (#30135)
Designed exclusively for Canon EF 8-15mm F4L USM* and Nikon AF-S Fisheye Nikkor 8-15mm F3.5-4.5 E ED *When using with a camera equipped with an APS - C sensor such as MDX - 80D, vignetting may occur in the four corners when using at the wide end (10 mm) and the shooting distance is short. In that case, use the tele (10.5 mm) or longer focal length.


【Features】
・Uses high quality BK7 crystal glass.
・Two different anti-reflective coatings are employed to optimize image quality, one for the exterior and the other for the interior of the Optical Domes. A multi-layer coating is used on the dome exteriors and the interior of the domes are coated with silicon-dioxide to effectively suppress flare and ghosting. As a result, the refractive index of each port is reduced to less than 0.01% and the domes produce extremely high-contrast images.

Difference in image quality between the Fisheye Dome Port 240 and the Optical Dome Port ll 165 under backlit conditions.
Equipment used: Canon 5D Mark lll and EF 16-35mm F2.8L ll. Depth: 5m


Specifications
[Dimensions (DIAxD)] 130 x 64.5(S) / 81(M) / 91(L) mm / 5.1 x 2.5(S) / 3.2(M) / 3.6(L) inches
[Weight] Approx. 372g / 13.1oz(S) 423g / 14.9oz(M) 450g / 15.9oz(L)
[Depth rating] 100m / 330ft
[Construction] POM resin ,BK7 crystal glass,(dome) and corrosion-resistant aluminum alloy(shade)
[Accessories] Instruction Manual,Port Cover,Port Case

System Sample

165mm in diameter. Versatile optical dome port, compatible with various fisheye and wide-angle lenses. Peripheral image quality will better when used with an Internal Correction Lens.


【Features】
・Uses high quality BK7 crystal glass.
・Two different anti-reflective coatings are employed to optimize image quality, one for the exterior and the other for the interior of the Optical Domes. A multi-layer coating is used on the dome exteriors and the interior of the domes are coated with silicon-dioxide to effectively suppress flare and ghosting. As a result, the refractive index of each port is reduced to less than 0.01% and the domes produce extremely high-contrast images.

Difference in image quality between the Fisheye Dome Port 240 and the Optical Dome Port ll 165 under backlit conditions.
Equipment used: Canon 5D Mark lll and EF 16-35mm F2.8L ll. Depth: 5m


Specifications
[Dimensions (DIAxD)] 185 x 70 mm / 7.3 x 2.8 inches
[Weight] Approx. 938g / 33.1oz
[Depth rating] 100m / 330ft
[Construction] corrosion-resistant aluminum alloy (anodized),BK7 crystal glass,(dome) and POM resin (shade)
[Accessories] Instruction Manual,Port Cover,Port Case

System Sample

230mm in diameter. Versatile optical dome port, compatible with various fisheye and wide-angle lenses. Boasts the best image quality, including peripheral image quality. Suitable for half-underwater-half-topside images. Peripheral image quality will be even better when used with an Internal Correction Lens.


【Features】
・Uses high quality BK7 crystal glass.
・Two different anti-reflective coatings are employed to optimize image quality, one for the exterior and the other for the interior of the Optical Domes. A multi-layer coating is used on the dome exteriors and the interior of the domes are coated with silicon-dioxide to effectively suppress flare and ghosting. As a result, the refractive index of each port is reduced to less than 0.01% and the domes produce extremely high-contrast images.

Difference in image quality between the Fisheye Dome Port 240 and the Optical Dome Port ll 165 under backlit conditions.
Equipment used: Canon 5D Mark lll and EF 16-35mm F2.8L ll. Depth: 5m


Specifications
[Dimensions (DIAxD)] 250 x 120 mm / 9.8 x 4.7 inches
[Weight] Approx. 2100g / 74.1oz
[Depth rating] 100m / 330ft
[Construction] corrosion-resistant aluminum alloy (anodized),BK7 crystal glass,(dome) and POM resin (shade)
[Accessories] Instruction Manual,Optical Dome Port Cover,Port Case

Specifications
[Dimensions (DIAxD)] 174x79.5mm / 7x3.2inch
[Weight] Approx. 410g / 14.4oz
[Depth rating] 60m / 200ft
[Construction] Corrosion-resistant aluminum alloy (alumite coating, antireflection coating)
- Dome: Acrylic
- Shade: ABS resin

Specifications
[Dimensions (DIAxD)] 174x87mm / 7x3.5inch
[Weight] Approx. 360g / 12.6oz
[Depth rating] 60m / 200ft
[Construction] Corrosion-resistant aluminum alloy (alumite coating, antireflection coating)
- Dome: Acrylic
- Shade: ABS resin