Quiz
See if you can answer each question. Click on the word "answer" to reveal
what I think (This will only work for DHTML browsers - others should display the answer on
loading)
- What might make you aim strobes in the wrong direction underwater?
Answer The magnification effect of the water which makes the
subject appear closer than it is.
- At what depth would you expect red colours to disappear?
Answer About 5 metres
- What are the two common solutions to this light absorbtion?
Answer Use underwater strobes and wide angle lenses
- At what depth would you expect light, and contrast drop-off to be noticeable
Answer About 15 metres.
- What are the two major things you can do to minimise backscatter?
Answer Move the strobe off the camera axis, and get close to the
subject.
- What can you do to ensure good contrast in your pictures?
Answer Avoid shooting at the beginning or ending of the day.
- What is Snell's Window
Answer The circular or elliptical area of the water's surface
through which objects above the surface can be seen.
This page was last updated on 11 August 1998
Please address any comments to Mark
Mumford
