The Tiffen 4 x 5.65″ Full Spectrum IRND 1.2 Filter is a combination of both an infrared control filter and a 1.2 neutral density filter.
This filter is constructed from Water White glass and is made 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. This filter measures 4 x 5.65″ / 101.6 x 143.5mm.