Re: underwater light meter

[busko at stsci_edu (Ivo Busko)]

Johnpitselos2000 at cs_com wrote:

> SCUBA / underwater photo specialists carry a variety of light meters for 
> underwater use.  Many have a variety of scales on them.

Photographic ligth meters trade range for resolution. They are capable of
measuring very brigth and very dim ligth, but cannot tell the difference
between ligth levels that are too close apart. A difference of a 1/4 f/stop 
corresponds to a factor about 20%, and its' hard to get from a regular
photographic meter. I believe meters designed specifically for aquarium 
use would work on a narrower range of illumination, but would provide better
resolution.

Just my $0.02 cents.

- Ivo Busko
  Baltimore, MD

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