TIA
This is a quote from another photographer:
I guess if people want to compare a 35mm film camera shooting velvia with a 5050, it's not really a valid comparison. The glass in the OLY is just not as good as the better SLR glass, and the size of the sensor is seriously small compared to DSLR's (like about 25% of the size). With that small sensor, big zoom, and lower end optics, comparing a 5050 is just not a fair comparison to a 35mm SLR. I'm not saying the 5050 are a poor shooting camera, I've certainly seen some really nice work with it, but it has some seriously limitations compared to an SLR.
Ok, so we know the 5050s have its shortcomings, when compared to a DSLR. (I still think its a very good camera)
So why do we want to handicap it any further by adding more and more pieces of glass by stacking a wide-angle lens add-on, wet or dry? Its bad enough that we have the housings lens port to shoot through (no way around it U/W).
My suggestion: get the 5050 or 5060, in an Ikelite housing with a dome port. (Olympus comes with a flat port).
Hardwire an Ikelite Substrobe 100 or so (Ebay) to the cameras hot shoe. And start shooting! Manual exposures only, forget the TTL.
Start by shooting pictures called close focus, wide angle shots, where you are within a foot away from your subject; the background could be open water. You should be in tack sharp focus on the lead object closest to the lens, so sharp you get almost reach out and touch the picture.
Review the pictures then decide if you are willing to give up that Tack Sharp Focus for a few more inches of wide angle by adding on a wide angle aftermarket lens.
Just my opinion