Tiffen 77mm 4 Point Star Filter

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Tiffen 77mm 4 Point Star Filter









Product Details

Size: 77mm

Brand: Tiffen

MPN: 77STR42

UPC: 049383051490

EAN: 0049383051490

• Product Dimensions: 4.3 x 4.2 x 0.9 inches


• Item Weight: 3.2 ounces


• Shipping Weight: 3.52 ounces


• Item model number: 77STR42

• Achieve 4-point star effects from direct or reflected light sources


• Add sparkle to water scenes and candle flames


• Filter may be rotated for creative control


• 77mm diameter

Size:77mm Product description Lighting can be enhanced in ways that go beyond
what exists in nature. Star filters create points of light, like stars,
streaking outward from a central light source. This can make lighting within
the scene take on a more glittering, glamorous appearance. This effect is
produced by a series of thin lines etched into the flat optical surface of a
clear filter. These lines act as cylindrical lenses, diffracting light points
into long thin lines of light running perpendicular to the etched lines. Lines
on the filter positioned horizontally produce vertically oriented star lines.
The size and brightness of the star lines produced are first a function of the
size, shape, and brightness of the light source. You have additional control
through the choice of a particular spacing between the lines on the filter.
Generally these spacings are measured in millimeters. A 1mm spacing has twice
as many lines per unit area as a 2mm spacing. It will produce a brighter star
for any given source. Spacings offered generally range from 1mm to 4mm, as
well as both narrower and wider for specialty effects. The number of
directions that lines run in determines the number of points produced. Lines
in one direction produce a two-pointed star, just a streak through the center
of the light. There are 4, 6, 8, 12 and more points available. With an 8 or 12
point filter, the many star lines will tend to overpower the rest of the
image, so use them carefully. Although the more common types have a
symmetrical arrangement of points, they can also be obtained with asymmetric
patterns, which tend to appear more natural, less synthetic. Create
four-point star effects from direct or reflected light sources.