Seems like there's going to be quite a few options available for the E-3. Good thing.

First of all question, probably mostly aimed at Phil, do you think there will be other brands of housings available for the E-420 apart from the expected Oly and Ike housings? It would be nice to have something as small as the Seatool housing for that one... Talk about small SLR setup.
As for the E-3, unless I decide to pick up the E-420 just for UW, I think it stands between the Seatool and the Nexus based on everything I've read here. I would probably go with a couple of Inon Z240 strobes with ULCS arms.
Now, the question is whether to go with Seatool or Nexus. Both seem to support FO which I've decided to go with. However, I have a hard time understanding which ports go with Seatool. I really like how the Nexus supports Oly / Athena ports out of the box, but at the same time would prefer the (probably) smaller size of the Seatool.
And what about UK-Germany? How do they compare to the others?
KT,
It appears that the E-410/PT-E03 housings are largely out of stock at least in the US and that no more will be forthcoming. The E-410 sold very well and I would expect the E-420 will do just as well. As a result I would expect housings to be available, however small companies like SeaTool will always build based on the number of units sold so Canon and Nikon will always be first in line. Since it appears that SeaTool will be building an E-3 housing it stands to reason that they see the value of the Olympus market.
I have the Nexus housing for the E-3 and just started using it over the weekend. I understand the prototype for the SeaTool may be ready in as little as six weeks. I am sure you would be happy with either housing.
The Nexus housing has the fiber optic ports which I am using with Inon Z-240 strobes and TTL is very accurate. I am sure SeaTool will include fiber optics as well.
Regarding housing size I don't think you will see a large difference. The Nexus E-3 housing seems to be built
around the same size box used for the Nikon D-100. I could see very little difference in size between the Nexus E-3 housing and the SeaTool Canon 40D housing when placed side by side. Since both cameras are in the same size range I would expect the housings to be much the same in size. If size is an issue for you as it seems to be with some here at Wetpixel I have attached a photo of the Nexus E-3 housing beside the Olympus E-410/PT-E03 housing to give you an idea of a starting point for your comparison. I would expect a SeaTool housing for the E-420 to be much smaller if it is made.
Regarding ports, my Olympus and Athena ports work like a dream on the Nexus housing and I would expect the same from SeaTool. The problem lies in the existing gears for the Olympus lenses. Olympus gears have a different outside diameter for each lens. This was overcome in the Olympus DSLR housings by having a floating internal zoom/focus gear, (one that moves slightly in and out to accept the gears). The Nexus housing as delivered has a fixed gear and much smaller teeth. As a result new gears need to be released.
I am now using a twenty-five year old Aquatica gear (from an F-3 housing) for the 50 mm macro and 1.4X tele converter. Ryan (Reefphoto) and I fashioned new gears for the 7 to 14 & 12 to 60 zooms with little problem so I am good to go for the time being. This information will be passed on by Ryan to Nexus and SeaTool in hopes of resolving the issue.
Regarding UK-Germany, they have no dealer in the U.S. so we don't see many of their housings here. In fact I am still waiting for the housing they said they would be building for my Olympus E-1.
Regarding DPReviews statement that "the Olympus 50mm F2 macro lens is one of the sharpest optics we've ever used" I would assume that this was compared to all format size lenses. Since I can't speak for DPReview perhaps someone should ask them what the intent of this statement was.
As Herbko has said "most people wiil be happy with the resolution of any of the current systems" for now DPReview is saying that the Nikon D-300 body is the best body of all the offerings and I have no reason to disagree.
If anyone has anymore questions regarding the Nexus housing please let me know.
Phil Rudin
