Optical sensor stack frequently use dichroic IR filters (aka hot mirrors) in order to improve colour accuracy. By transmitting visible light wavelengths while reflecting unwanted infrared, the filter is found in almost every digital camera. However, a trade-off using such filters transmit and reflect light unevenly depending on the angle of incidence. This phenomenon is causing off-axis colour casts. This can be particularly problematic with lenses with short exit pupil.
Today, ACHTEL announces introduction of ClearCast – a revolutionary optical sensor stack design that retains spectral characteristics on and off-axis. Unlike traditional dichroic filters and hot mirrors, ClearCast filters out UV and IR spectra evenly across the image frame while offering 99% transmissibility to visible light.
“It is a very complex filter” – says MR Achtel, the company’s executive officer. “It has all the benefits of traditional dichroic filters, while producing even spectral distribution across the sensor frame without unwanted colour cast that we used to accept as inevitable image degradation.”
ClearCast optical stack is exclusively available in ACHTEL 9×7 digital cameras with immediate availability.
ACHTEL 9×7 digital cinema cameras are specialised cameras for VFX, VR, Giant Screen and IMAX productions offering sharpness well in excess of any other motion picture cameras including 15-perf 70mm film that it was designed to replace. ACHTEL 9×7 cameras also offer advanced and innovative colour management solutions delivering true colorimetric images without the need for colour correction in post processing.