Tania
Can you tell me the settings you use with your A640? I also have an A640 with a canon housing and an Ikelite slave strobe. Part of my confusion is the manual white balance - I thought you have to take a pic of something white at depth, then save it as a new white balance setting. I have taken some nice pics over the years, but I think I can do better if I enhance the settings in M mode. Heading to St John next month and I'm planning to give my A640 a workout!
Thanks
Bill Henschke
Two things to remember; 1) if you use your strobe, you don't need to white balance, 2) You can take photo's without a strobe if you white balance.
How to white balance with the A640:
1. Turn the Shooting Mode Dial to "C." You can use other shooting modes, but this gives you the most control underwater.
2. Press the Function Set button to bring up the on shooting options
3. Press the Macro Function button (MF with flower above it) down until you reach the Menu Evaluate White Balance menu. It's the second menu from the top.
4. Scroll to the right until you reach the Manual White Balance setting. It's one setting to the right of the Underwater White Balance fish.
5. Once on the Manual White Balance setting, hold a white slate about six inches away from the front of your camera.
6. Click the Menu button.
You have now set your white balance for the current depth. If you change depth +- 10 feet, you'll have to repeat this process.
You can save this shooting method so that when you turn your camera off and back on it comes up on the Manual White balance settings. Then, all you have to do is put the white slate up and click the Menu button.
Hope this helps.