Sweet shots Laz.....a 105 with 4T diopter will make you a happy camper

...you've just got to break down and get that housing for your D70
Karl
Must..resist..the..dark..side... 
Yeah, I'll be breaking down any day now and I'll order a housing for the D70. I'm thinking more along the lines of the 105 with a TC, though. Maybe I should start with a 60 -- gotta learn to doggy paddle before you can swim, right? 
Poor Laz, pretty soon you're going to start craving the kind of glass that only comes in microscopes. Forget that 105 w/ a 4T diopter, just get a Leica MZ12 and you'll be able to do 8:1 to 100:1. Of course, it might be a little tricky to take it underwater but I'm sure you'll figure that out!
Ooooh, yeah! That would be sooo great. Then I'd finally be able to get more photos of plankton -- my favoristest of all underwater photos. I've thought of getting some kind of microscope with the adapter to attach my digital camera to it. I'd just have to do everything out on the boat as I don't have the heart to sacrifice a plankton just to get its photo.
The sea spider is awfully nice. It's really hard to get a good combination of focus & depth with these little guys. By the way, it's a he, not a she - like seahorses the males carry the eggs after the females lay them.
It's not surprising that this isn't in Humann's book. His creature id books are great but they basically show the big or popular stuff, which is probably less than 1% of what's actually there.
Wow! You are always sooo helpful and informative. Thanks, Leslie. I truly appreciate all the insight into this interesting little critter. The latest edition of Humann's book does have the Caribbean Sea Spider but it is mentioned as seen only in the Caymans. One thing I found interesting about one of my Sea Spider photos is that it appears as though they have 4 eyes, much like those of a nudibranch (small black dot). I will have to revisit the area where I found the little fella. While it says in the book that they feed on cnidarians and other soft-bodied animals, I found this one on a sponge. Could be he was there to eventually release the babies.
Would you recommend any other books or places to find and learn about such odd critters?
Now if I could only find that Pygmy Seahorse -- you never know! 