The ALccd-QHY 21, 22 and 23 cameras feature state-of-the-art Sony sensors. They offer significantly more sensor area than cameras with the legendary Sony ICX285 sensor. The electronic noise, which was already extremely low at the time, has been reduced even further. The quantum efficiency is at a significantly higher level of just under 79% (550 nm).
All three models, ALccd-QHY 21, 22 and 23, differ only in their sensor and pixel sizes. They are available as black and white ("mono") and colour cameras ("colour"). The colour camera models are equipped with a UV/IR blocking filter (transmission approx. 350 to 700 nm). The black-and-white counterparts have multi-coated clear glass instead (full sensitivity according to sensor characteristics).
The ALccd-QHY cameras have the full data range of 16 bits. The advantages are obvious. Under the same conditions, they achieve better differentiation between light and dark, a higher limiting magnitude and significantly better colour differentiation than cameras with 12 bits.
The ALccd-QHY 21, 22 and 23 cameras do not require an optional T-ring for attachment to the telescope, spotting scope or microscope, as a suitable T-thread is already integrated into the housing.
The gas-tight camera housing is designed to prevent the chip or cover window from icing up (moisture trap). It has a connection for drying cartridges and a built-in sensor heater. The cameras impress with their small and lightweight housing. This puts little strain on the focuser.
Due to the readout method (progressive scan), no mechanical shutter is necessary. This feature reduces the structural dimension. Therefore, the camera can be integrated into your optical system with greater flexibility.
TheALccd-QHY 21, 22 and 23 can lower the temperature of the sensor to minus 40-45 degrees ambient temperature via cooling. The temperature is controlled via the supplied DC201 control box and the camera's control software.
