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I'm afraid I do not agree with Interceptor, The Tough 8010 has an internal zoom and the lens does not extend. The PT-048 housing has a 52mm thread and you have a couple of options regarding wide angle lenses.
Using a 52-67 stepping ring you could use the Inon UWL H100M67 type 2. This lens will sit almost over the port and you should not get any vignetting.
The other option is the Epoque DCL-30. This lens can be ordered with a 52mm thread and will attach directly to the housing.