Orange filter for PEN housing?

[Waterbase]

Hi,

Does anyone know how to mount an orange filter on a PEN (PT-EP01 in my case) underwater housing?
I've seen this pic:
Apparently, this is a PL-3 - I would just like to know what that adapter is, and where I can get it....
Using smaller filters with the Oly adapter for macro lenses is also possible, but that would limit the view considerably, of course - I don't want that!

Thanks very much for your ideas!

 

[TheTrickster]

That looks like its attached to a Zen 100mm port.

The only standard option I can think of for the PT-EP01 is:

1x PMLA-EP01 (Olympus M67 Macro lens adapter for PT-EP01)
1x 67mm Orange Filter from a company - like M A G I C - F I L T E R S

I can't see how it will limit the view? As the PT-EP05L Housing has a 67mm thread as standard on that port and can use the same lenses.