The housing is sold separate from the ports (the front port). It comes without any port and those are added according to the lenses you use.
Indeed, you generally need a different port / extension combination for each lens, but many lenses work under the same dome port, and only require a different extension which is cheaper than a new port.
Ikelite offers either a modular combination – 8″ Dome + extensions in various sizes, or a fixed port option, which is just a smaller dome port and no extensions required.
The modular option is better if you plan to use several different lenses. The fixed option is more affordable.
The larger dome also improves optical quality, corner sharpness and makes it easier to shoot over / under shots (split shots).
You can read more about it here: http://www. housingcamera.com/blog/guides- tutorials/getting-first- underwater-dslr-system
For the 18-55, you can either use this:
Or this:
UPDATE: The fixed Ikelite ports are now discontinued. Ikelite offers the modular ports only.
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