FEATURES OF VARIOUS PORTS

Port Type

Corresponding Fathom Port

Camcorder Positioning Requirements

FOV in Water

Full Zoom Thru

Color Fringing

Image Clarity

Distortion

Flat Port N/A

3-4mm

native camcorder FOV in air is diminished by 30%

yes yes good none
2 - 3 Element Adapter WA80, WA90, WP25, WP25A 1-2mm 70° - 80° partial & full zoom available minimal excellent 2% - 8%
Multi Element Adapter SWP25, SWP25B, SWP44, SWP44B, SWP44C less than 1mm 90° - 100° yes none superior 1% - 4%
Spherical Port N/A 3-4mm native camcorder FOV in air is preserved no minimal soft corners none
Wet Lens Light & Motion Wetmate 1-2mm 60° - 65° partial none excellent 3% - 10%

 

ADVANTAGES AND DISADVANTAGES OF VARIOUS PORTS

  Advantages Disadvantages
Flat Port minimal restrictions on camcorder placement within housing small FOV, color fringing visible off axis with high FOV camcorders
Spherical Dome maintains native FOV of camcorder soft corners and limited zoom thru capabilities
2 - 3 Element Adapter large FOV with high resolution imaging and minimal distortion camcorder alignment within housing is critical and camcorder compatability is often limited
Multi-Element Adapter superior image resolution with exceptionally large FOV/ near zero distortion / full zoom thru /split shot (air/water) imaging high cost / camcorder alignment within housing is critical /camcorder compatability often limited
Wet Lens simple option to obtain reasonable image quality / moderate FOV in water bubbles formed on lens surface appear in image / water in contact with both lens surfaces limits maximum angular magnification