The Formatt-Hitech 4 x 5.65" Firecrest ND 0.3 to 0.9 Filter Kit contains 3 Firecrest ND filters, ranging in density from 0.3 to 0.9 to provide a reduction in exposure from 1 to 3 stops. By darkening the entire image, you can photograph with a wider aperture or slower shutter speed than normally required for greater control over focus, movement, and brightness.
The design of these filters has been optimized for use with digital sensors and promote nearly flat attenuation of visible, UV, and infrared light. Due to imaging sensors' greater susceptibility to infrared light, compared to traditional film, color casts can occur when photographing darker subjects that require increased exposure times. These filters provide a high level of neutrality across all three spectrums in order to eliminate color casts and ensure cleaner, truer blacks.
Sandwiched between layers of Schott Superwite glass is a 15-layer Firecrest multi-coating, which helps to minimize reflections and flare in order maintain truer colors and contrast. Since the coating is located within the middle of the filters, they are less prone to scratching or damage and have a more durable and hydrophobic design. Each filter in this kit measures 4 x 5.65" / 101.6 x 143.5mm and is 0.16" / 4mm-thick. A padded pouch is included for storage and transport of the filters within this kit.