SEAPRO
SEAPRO OPTOLITE CORRECTED PORT

The SEAPRO OPTOLITE PORT is exclusive to Greenaway Marine.
This underwater optical corrector enables the video camera to be used above water, below water, even half in and half out of water.
The depth of focus is outstanding, being from a few millimetres in front of the Optolite port to infinity in most cases. You can zoom in air or underwater, it increases edge definition by producing a sharper image.

HOW DO THE FLAT PORT, DOME PORT AND OPTOLITE PORTS COMPARE?

FLAT PORT You need to focus for all shots, modern auto focus video cameras do this very well.
SEAPRO use flat ports for this reason.
Your image will fall off and have barrel distortion at very wide angle lens settings, but underwater you rarely have straight lines to show this distortion, plus most of the time the depth of field hides the fall off. If you use high quality wide angle lenses the problem becomes MORE noticeable.
You do, however, have your angle of view reduced by 25% when using a flat port and you have no depth of focus.
You can produce a half in half out shot, but the water air interface will be out of focus, producing an unsightly line across your image.

DOME PORT The main use of the dome port is to restore the angle of view of the lens when underwater. It acts as a clear window when on the surface. However, when underwater it produces an apparent image that you must focus on to produce a sharp picture. This means you must focus at approximately 12" underwater. If you move the housing out of water in to the air, the camera will still be focused at the apparent image at approximately 12". This will mean the in air picture will be out of focus. Modern video cameras will re-focus to give a sharp image, this usually loses the shot you were after when coming from underwater to the surface.
Some housing manufacturers fit a +4 diopter close up lens between the dome and the wide angle lens, this produces a good image underwater but will always be out of focus in air.
To produce a half in and half out shot you must use a 8" diameter dome. As most video camera housings are only 7" in diameter this is impractical and expensive.
Dome ports also have two further drawbacks, they are exposed, protruding from the main housing body, just waiting to be scratched or knocked and they are also very susceptible to flare when looking towards the surface.

The Optolite port overcomes all these problems.

SEAPRO
OPTOLITE PORT
This port has a flat front and is therefore less likely to get damaged. You have one focus setting for in air and underwater, it can therefore be used half in half out. It is smaller than a dome, if you are correcting for a wide angle lens, hence less exposed also reducing the chances of flare underwater.

You may need a slight focus adjustment for extreme macro shots, but with most video cameras the auto focus will set itself once.

The Optolite Port has vast depth of focus, you are able to produce wide angle close ups even with creatures sitting on the corrector and sun in focus on the surface!

If you require the highest optical quality the SEAPRO Optolite Port is the one to go for, the flat port is the next best compromise.
Optolite is a specially formulated plastic originally produced as a substitute for lenses in high quality optical instruments. It is now being used by Greenaway Marine exclusively in the production of the Optolite Corrected Port. The units are mounted into an aircraft grade aluminium mount which has been anodised for maximum protection.
Ports can be interchangeable if required, at extra cost. Most are fitted as a permanent unit.
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SEAPRO WATER DETECTOR
The SEAPRO Water Detector enlightens you to the smallest ingress of water.
Video cameras DO NOT LIKE WATER.
You mount the sensor probes in the lowest part of your video camera housing with the warning light, an 8 mm diameter red LED, near your viewfinder or clearly visible inside the housing.
The red LED will glow even if you moisten your finger and touch the sensor.
Fresh or salt water will produce a very bright light easily visible even in tropical waters.
The unit is powered by a lithium battery which will last for about 10 years, the Seapro Water Detector only uses power when activated, it can be left in the housing for constant protection.
The Seapro Water Detector is easily fitted by double sided sticky pads and the sensor and wire held in position by sticky backed wire grips, supplied with the unit.
The cost is minimal compared with replacing a flooded video or still camera.
Specification: Indicator: 8 mm red light emitting diode.
Power: Lithium battery (10 year shelf life).
Tube Dimensions: 28 mm diameter. 55 mm length.