Can I use wide angle lens with smaller OD mount than camera housing?

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DazedAndConfuzed

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I have a Oly C5050 w/PT-015, which has 67mm housing. Can I use wide angle adapters that has smaller than 67mm mount? Given that the lens itself is more like 25mm in diameter. Much of the light output from a wide angle lens w/67mm adapter goes into waste (Its analogous to using a full frame SLR lens on a DX format camera).

The C5050's widest setting is 35mm equiv, so I presume vignetting will be less of an issue compared to some camera with a 24mm equiv.
 
https://www.shearwater.com/products/teric/

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