The IRT-5000/7000 Series has a choice of standard detectors and a wide range of optional detectors. An optional second detector can be installed with either a fixed detector or the SDC-5000 detector-cassette system for interchangeable detectors. The optional detectors cover the wavelength range from the visible (silicon photodiode), near-IR (InSb or InGaAs) to mid-IR (narrow, mid and wide band MCT). The far-IR can be covered with a custom bolometer.