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After testing the housing for the 640. I can only say it handles as any other in the canon range. Its a good size and at least this one allows space to put in Silica jell packs. All functions are easy to use. Clear sight. Sadly No Hood to shade from the sun. When used snorkelling. I found it hard to view the subject both on taking and play back. Ive had to make a hood from another screen shade and modify it to fix with sylicone.
this also protects the viewing area from scratching as the first dive, I found that the case in that vital area had been scratched. Will Canon be good enough to re make this one and send me a free one ? :-)
Other draw back. Why have such an odd shape on the lens case chamber so the use of other under water lenses is impossible. Sadly the big draw pack is the flash cannot get to the subject on macro so this is why an IS lens and 1600 iso would have been better. on the the A 640 camera. Close up shot would be wonderfull if only the rubber inside the lens chamber would not block out the light.