Hi Mexwell. I can't answer all your questions, but here are some:
0. The bottom line from my research on this forum was that this lense is not a good lense for a full frame sensor and an Ike housing. (See below). If you have flexibility on camera or housing, maybe it would work.
1. I used the 17-40 on the 5d a bit with the 6" port. The 6" port produces completely smearly corners. At 40mm you could crop out and use the middle, but at 17 I considered most of the photo unusable. Slightly better if you shoot at f22 the whole time, but who wants to be limited to f22?
2. Indeed, there is no room for a diopter. The lens focuses close enough that you can "Achieve focus" without one, but not sharp corners. I suspect you can probably do close focus WA with this lense but somebody else should confirm.
3. There are a couple of threads that talk about this lense and other WA options for 5d (same geometry issue as 5dII), and post pictures taken. The 8" dome had better corners than the 6" dome with this lense, but still not what I would consider acceptable. The only combination I found examples of that seemed to do a pretty good job was the Canon (or Sigma? can't remember) 15mm Fisheye and the Ike 8" dome port. Some people had good advice on this back in 2007ish - search "taxgeek" and "15mm" or "17-40" and they should come up.
4. 17-40 does have a rear filter holder so you could use magic filters.
as I am in the market for an 5D MK II housing I consider Ikelite beneath others.
I had great results with Canons 17-40mm lens so far and consider it to be my WA choice.
When I read Ikelites port chart it states the #5503.51 BUT says also:
"Port is not long enough to accommodate accessory diopters or filters."
- Is a +2 Diopter needed to get acceptable corner sharpness?
- Is close up WA (Dr. Mustards TM) possible without a diopter?
- AFAIK the 17-40mmm has a rear filter holder, Magic Filter will be possible after all
- Is the Port #5503.51 a good choice or is the 8" Dome necessary?
I would love to see sample pictures of this setup on a full frame camera....
Edited by Taxgeek, 21 July 2009 - 12:59 PM.
Canon 5d, Ikelite housing, ULCS arms, and dual DS-125 strobes.