The internal camera light meter can be used to obtain consistent exposures. First the ASA should be properly set on the camera. In my experience, I have found that the best exposure tends to be one stop below the metered exposure. Often it is a good idea to bracket exposures, taking a photograph one stop below and one stop above the metered exposure. Photographs should be taken using a red filter.
Red filters tend to increase contrast between foliage and canopy openings.
Metering must be done with the filter in place. When metering the exposure, it is necessary to temporarily move the camera from its correct position and make adjustments of the shutter speed and aperture. After making adjustments, the camera should be returned to its correct position, and orientation relative to north should be verified. Taking Photographs After the camera assembly is properly positioned and the exposure settings are correct, photographs can be taken. In general, photographs should be taken using the camera self-timer.