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A basic overview of filters and how they're used in photography.
Filters are typically used to control the brightness of areas in the image (for example, a bright sky) or adjust the exposure time creating a variety of in-camera effects.
This page provides a basic overview of filters for the filter novice, plus links to additional pages detailing filters used in specific applications, such as landscape photography.
4-6 stop ND filters create a moderate lengthening of exposure time to create a misty effect in moving water. Usually around 1 second.
6-10 stop ND filters create 2-30 second exposures that are perfect for waterfalls, streams, and seashores.
13 stop ND filters are used to create ethereal effects in water and clouds, with exposure times around 2 minutes in duration, especially in areas where clouds are moving quickly (such as coastal cities).
16 stop ND filters are used to create the long exposure effects - such as streaky clouds and flat water - that have been popularized by photographers such as Joel Tjintjelaar. 16 stop filters allow the photographer to make 5-8 minute exposures, even during mid-day lighting conditions.
Because the ND effect comes from the coating itself, we’ve gone to great lengths to protect it. On our rectangular filters the coating is sandwiched between two pieces of bonded glass. This protects the coating completely and allows us to lap and polish the filters to the highest tolerance in the industry, meaning your filters will have the lowest possible distortion. On our circular filters, the coating is featured on the outside of the filter because the ring protects the filter. This allows us to add anti reflective and hydrophobic coatings to the outside of our circular filters.
Firecrest filters are available between 1-10 stops of ND, plus 13 and 16 stops for long exposure.
ND filters are also available as grads or graduated ND filters. These filters provide the ND effect on a selected part of the scene. The most common use of a grad filter is to reduce the luminance of a bright sky to match the terrain below.