The Tiffen 82mm Deep Yellow #15 is commonly used for a noticeable increase in contrast with black and white films. It is also used to increase the separation of clouds and sky in black and white photography.
The 82mm #21 Orange Filter from Tiffen
is a filter designed to build contrast in black and white photography
and creates separation between the tones. The filter absorbs blue and
blue-green colors, rendering blues darker such as for skies in landscape
or aerial photos and water in marine shots. The filter has a filter
factor of 4.5, so you must increase your exposure by 2 1/3 of a stop to
compensate.
Tiffen filters are not dyed, but are manufactured by using ColorCore technology. This process laminates the filter material between two pieces of optical glass and grinds down and polishes the glass. The glass is then mounted to the metal ring, which after that can be screwed onto the lens for the desired effect.
Tiffen Optical Filters
Tiffen filters are manufactured using ColorCore™ technology, a
closely guarded proprietary process that entails permanently laminating
the filter material in between two pieces of optical glass that are
ground flat to tolerances of a ten-thousandth of an inch, then mounting
them in precision metal rings. The ColorCore process allows us to
control the color and density of Tiffen filters, and the characteristics
of special effects filters with much greater accuracy than typical
dyed-in-the-mass filters, which usually exhibit color and density
variations.
Filters, like all crafted optics, are susceptible not only to breakage, but to premature aging caused by environmental factors. Most filters are made up of several layers of materials consisting of glass, dyes, optical cements, chemical compounds, particles etc. Even with protective measures employed, there are many factors that can still affect the longevity of the filter: moisture (prolonged exposure to humidity), excessive heat and excessive light are the most common environmental causes that can affect the filter’s chemistry over time.
To protect your filters and keep them in great working condition for a long time (along with the rest of your camera gear) we recommend making sure to keep the filters stored in a dark, cool, and dry place when not in use. The use of filter pouches or specialized cases will also keep your filters safe from breakage when not in use. If you are in a humid environment, the addition of fresh silica gel packs or a dehumidifier in the room they are stored is also highly recommended. Protecting your filters as you would your camera lenses will ensure many years of use of your filters.
What do you recommend cleaning filters with?
Hand blower first, if it's just light dust, that usually handles it. If you need to clean further, a Kim Wipe sprayed with Tiffen/Pancro Lens Cleaner, work in a circular motion from the middle out.
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