Center Spot
These filters have a clear spot in the center which has no filter effect. The surrounding area is treated, either colorless with diffuser effect or more or less intensely colored. This means that the subject in the center of the picture is reproduced clearly while the surrounding area which is often distracting is changed, usually colored or darkened.
The main area of use is for portraits.
Filters with 060 numbers are for lenses in the focal length range between 50 and 250 mm, those with reference numbers in the 070's are intended for wide-angle lenses of between 20 and around 40 mm *but work best with any lens length.
*I have the 070's filters now and like them best and so do others that have given up the 060's filters
50 - 200 mm
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*Wide angel
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Description
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Are colorless with diffusion effect.
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Have a Gray surrounding area which blocks out light
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Violet
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Green
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Orange
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Blue
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Red
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has the colors pink and blue asymmetrically distributed
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pink-yellow
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blue-yellow.
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The Bicolor filters are not symmetrically colored, and different effects can be obtained with the same filter just by rotating the filter holder.
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Effect filters that technically are center spot filters:
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The transition from subject to background, and also the size of the clear circular area, depend on focal length and aperture. The transition is more gradual when the aperture is opened wider. The circle becomes larger as focal length is increased. The circle becomes larger and less clearly defined if the filter is placed further forward. The distance between your lens and the Center Spot filter can be varied by using the Cokin Modular Hood and a Coupling ring .
Center Spot filters are the perfect solution to the problem of background composition. Whether Surrounding area should be of the same color as the subject or of a contrasting color is a matter of personal taste. When the light source is behind the photographer, the center spot filter appears dense. With backlighting, particularly if the light strikes the filter directly, a soft. And glowing effect is produced. The size of the central area also depends on the groove into which the filter is inserted.
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