We have a range of ports on offer for underwater camera housings and professional underwater video housings. They vary both in length and type of pane, depending on the lens being used. The crop factor also has to be taken into account, and hence the categories of full format sensors below:
|2||entsp. Four Third||21,3 mm|
|1,6||entsp. APS-C||27,1 mm|
|1,5||entsp. APS-C||28,3 mm|
|1,3||entsp. APS-H||33,5 mm|
They are available in different lengths and can also be used on macro ports. For each lens type, we have a special solution macro port with M67 thread.
If flat ports are used on wide angle lenses with a focal length of less than 28 mm, peripheral blur will result.
Fisheye ports are available in either PMMA or glass. The glass ports produce a better image quality, but cannot be used once scratched.
PMMA ports can be restored to usable condition again after polishing and have the advantage of being lightweight.
They can be used on various lenses, and the photographer does not need two different ports, but rather can simply lengthen or shorten the port for each lens.
Thus a port is used for the first lens, and the second lens is made up of the port and the distance ring (port extension) used together.