67-294 12.5 mm Dia. Traditional Coated OD 2.0 Longpass Filter; t=1.5mm 1150nm

The 67-294 is a Longpass Filter, a type of optical filter that passes longer wavelengths of light and blocks shorter wavelengths, from the renowned optical components vendor, Edmund Optics. This particular model boasts a 12.5 mm diameter and a thickness of 1.5 mm, making it suitable for a wide range of optical applications.

The filter is designed to cut on at 1150 nm, meaning it starts to transmit light at this wavelength, while it cuts off at 0 nm, blocking all shorter wavelengths. This specific characteristic makes it ideal for applications where the detection of longer wavelengths is crucial, such as infrared (IR) spectroscopy, night vision, and heat-seeking technology.

The 67-294 model features a Thin Lens shape, which is a lens with a very short focal length compared to its diameter. This shape, combined with its 12.5 mm diameter, allows for a wide field of view and minimal distortion, making it suitable for wide-angle applications.

The filter is coated on both the front and back with Edmund Optics' proprietary coating, EDM 67-294. This coating enhances the filter's performance by reducing surface reflections and increasing transmission, thereby improving the overall efficiency of the optical system.