This is a 4-Filter set of Tiffen IRND (Infrared-cut Neutral Density) Hot Mirror FIlters in 4×5.65″.

It includes:

+Tiffen IRND 0.3 Hot Mirror 4×5.6
+Tiffen IRND 0.6 Hot Mirror 4×5.6
+Tiffen IRND 0.9 Hot Mirror 4×5.6
+Tiffen IRND 1.2 Hot Mirror 4×5.6

Plus carrying pouches for each filter.

The filters measure exactly 4 x 5.65″ (10.16 x 14.35 cm), and are 4mm thick (standard size).

Hot Mirror IRND Filter are a combination of both a hot mirror infrared (IR) control filter and a neutral density (ND) filter. A hot mirror IRND is ideal for digital cameras, which have greater low-light sensitivity and, subsequently, an increased susceptibility to IR contamination. When using a standard neutral density filter to counter the increased light sensitivity afforded by the HD sensor, the effects of infrared pollution become more apparent. This filter combines an ND filter with a comparable IR control filter to eliminate the spill of infrared light reaching the sensor while still maintaining the extra exposure benefits of a neutral density filter. The hot mirror filtration incorporates a dielectric mirror in order to combat the effects of both near and far infrared regions of the spectrum.

-This filter is constructed using ColorCore technology, a process that involves laminating the filter substrate between 2 pieces of optical glass and grinding flat to a tolerance of 1/10,000th of an inch.
-The infrared control filter helps to block infrared pollution from affecting the color fidelity of imagery; this enables a wider color gamut and truer colors, especially noticeable in the darker regions of the image.
-The Hot Mirror filter blocks infrared pollution from both near and far regions of the spectrum while allowing all visible light to pass.

Want it with a Tilta MB-T12 3-Stage carbon fiber Matte Box? Here’s the package:
https://www.sharegrid.com/losangeles/l/171416-tilta-mb-t12-4×5-65-light-mattebox-4x-tiffen-irnd-0-3-1-2

About the brand and filter technology:
-The Tiffen IR ND Filter is produced using Water White glass
-As with all Tiffen filters, their IR ND filters are ground and polished to provide the greatest level of flatness and parallelism. This, together with their exclusive ColorCore technology, ensures the highest level of optical quality
-The ColorCore process allows Tiffen to control the color and density of this filter 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
-Top Hollywood motion picture studios rely on Tiffen filter for multimillion-dollar productions ; even NASA uses their filters for certain applications.