Hi Jon,
The E900 works quite fine without strobes (all the reef pix are with strobe, the rest are without). In fact, Fuji has a 'natural light' mode to showcase its more sensitive CCD. Manual white balance (set values and custom values) are available for P,S,A,M modes (program, shutter/aperture priority, manual). The housing size for Ikelite is roughly the same as the PT015 because the E900 is so much smaller than the 5050, it looks much smaller sitting inside the housing.
http://ikelite.com/web_two/fuji_e900.html
Forgot to mention: I had to paint the front barrel of the E900 black because it's metallic and created quite a bit of internal reflection with the port / screw-on lens.
Peter
