|The PATENTED URPRO Optical Plastic CY/GR camera filters have the same COLOR CORRECTING ABILITIES as the URPRO Optical Glass Filters. |
CARE OF URPRO OPTICAL PLASTIC CAMERA FILTERS DO'S
- After each dive, immediately rinse the URPRO Optical Filters with FRESH WATER.
- Immediately and GENTLY DRY both the URPRO Optical Plastic filter surfaces.
- Always dry filter surfaces with an absorbent SOFT CLOTH.
|CARE OF URPRO OPTICAL PLASTIC CAMERA FILTERS DON'TS|
- DO NOT wipe a dry URPRO Optical Plastic filter.
- DO NOT dry URPRO Optical Plastic filters with a paper towel.
- DO NOT use URPRO or SeaChrome Optical Plastic lenses in a swimming pool containing chlorine.
- DO NOT clean any URPRO or SeaChrome lens with a cleaner containing solvents, ammonia, chlorine and/or abrasives of any kind.
|OPTICAL LENS SURFACES|
|URPRO and SeaChrome lens surfaces are optically perfect for absolute distortion-free underwater viewing and imaging. |
|USING STROBE LIGHT AND URPRO FILTERS |
|Any URPRO CY or GR filter can be used easily and effectively with daylight and strobe light! Sunlight and artificial light from strobe units produce approximately the same color or Kelvin Temperature.
Artificial light and sunlight behave in the same fashion as they each pass through water. It is suggested the strobe light be one f/stop less than the metered available light, i.e., the strobe light acts as a "fill light".
When using a normal lens or a wide-angle lens, the strobe light mist be at least 6 measured feet from the subject to insure proper color balance.
|UNDERWATER FILTER DISTANCE |
|Because all water is a continuous filter, the deeper a sub-sea photographer goes beneath the surface, the more colors are naturally "filtered-out" of the spectrum.
As a result, the depth of the water must be added to the distance between the camera (or flash) and the subject to give the underwater filter distance.
+ Depth of water
+ Distance from camera (or flash) to subject
=Underwater filter distance.
|PROPER FILTER SELECTION|
|Use fast films! Use ASA 200, ASA 400 or even ASA 1000 film with available light photography. Fast films increase the depth of field and produce sharper pictures because of less camera movement.
Try color negative films rather than slide films! The color negative films which produce color prints also produce color slides and enlarged transparencies. Color negative films have considerably more exposure latitude than slide films, plus they can be color balanced.
To insure the best color balance with color negative films, shoot and process the film normally. When the prints or transparencies are made from the negatives, have all of the color cyan (blue-green) or green removed.
|URPRO VLF FILTER AND VIDEO LIGHTS |
|For best results, always use one or two 50-watt DIFFUSED 3200 Kelvin lights. Lights brighter than 50 watts or without diffusers may produce improper color balance.
The URPRO VLF filter is designed for use with available light and/or DIFFUSED video-movie lights.
|AVAILABLE LIGHT VIDEO BALANCE|
|As a general rule, adjust the video camera color balance setting to DAYLIGHT when using any URPRO filter. |
|MOVIE FILM COLOR BALANCE |
|To achieve accurate color balance using the URPRO VLF filter and color negative movie film have the color CYAN "removed" from the work-print and all subsequent copies of the film footage. |
|VIDEO MONITOR COLOR BALANCE|
|To achieve improved color balance, adjust the color monitor/TV being used to view video tapes! Significant saturation and improved color balance can be achieved with minor adjustments. |
|IN A FOG? |
|FOG can collect on ANY lens surface. It restricts vision, impairs safety, and inhibits photography and videography. Fog can even render anti-fog coatings ineffective.
Fog is caused by a very small electro-statically charged particle which attracts a particle of water vapor. These microscopic particles attach themselves to most glass and plastic surfaces. The particles are typically composed of airborne dust, smoke or sediment and minerals found in fresh and salt water.
When the temperatures of the air and/or surface of a lens drops, "invisible" water particles condense into liquid water vapor. Electro-statically charged particles are the center of the water droplets. This vapor forms a thin - but visible - layer ON TOP of a camera lens camera port, or dive mask ...even ON THE SURFACE of a perfectly functioning anti-fog coating!
Spectrum Technologies' FOG-GONE lens cleaning solution is formulated to REMOVE and DISSOLVE the microscopically thin fog-causing-layer of electro-statically charged particles. FOG-GONE is safe to use on ALL coated and uncoated optical plastic and glass lens surfaces.