Canon AS-1 User Manual

Page 55

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Tips for Better Underwater Photography

actual size
apparent size
actual distance
apparent

distance

Here are some tips that can help you take better pictures

under water

•The refractive index of water is 1.33 times as large as air,

so that subjects under water appear about 25% closer

than they actually are. Therefore, 1-3m will actually

appear to be 0.75-2,25m when you use the regular mode

(0.45-1 m will appear to be 0.34-0 75m when you use the

underwater macro mode).

•Water absorbs red light, causing color pictures to appear

bluish. You can minimize this by getting close to the

subject and using the flash

• If you use the flash when you are far from the subject and

in unclear water, the flash reflects off fhe plankton or

other particles which may appear in the picture. In these

situations, use the underwater macro mode ^ i) or the

@ Flash OFF mode .2} to take the picture.