[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Re: light meters
jgarden2000 at juno_com wrote:
>
> > I've often idly wondered if those light meters used in professional
> > photography could somehow be made waterproof...
> >
> > - Erika
>
> It shouldn't be too hard to put a mirror on the bottom of a tank angled
> at 45 degrees and stick a light meter up to it on the outside of the
> glass...
>
> William
This won't work. Photographic light meters measure diffuse light. You
should
use a white matte surface instead of a specular reflector. Search the
APD archive,
I've posted the procedure I used to estimate the light level at the tank
bottom
using a SLR camera and a white china plate.
- Ivo Busko
Baltimore, MD
"Buy a fish, Save a tree !"
Project Piaba: http://www.angelfire.com/pq/piaba/