The ALccd-QHY 8Pro colour camera is the ALccd-QHY model with large pixels. In terms of chip size, it is comparable to a digital SLR camera. Unlike non-astronomically modified DSLR cameras, the ALccd-QHY 8Pro is sensitive across the entire range from approx. 350 to 700 nanometres.
Further advantages of the ALccd-QHY 8Pro over a reflex camera:
- Almost all commercially available DSLRs work with a data depth of 12 bits, i.e. 4,096 grey scales. This is not ideal for astrophotography. The ALccd-QHY cameras have the full data range of 16 bits. The advantages are obvious. Under the same conditions, you achieve better differentiation between light and dark, a higher limiting magnitude and significantly better colour differentiation.
- All ALccd-QHY 8Pro cameras do not require an optional T2 ring for mounting on a telescope, spotting scope or microscope, as a suitable T-thread is already integrated into the housing.
- The ALccd-QHY 8Pro is designed to prevent the chip or cover window from icing up (moisture trap).
- Due to the readout method (progressive scan), no mechanical shutter is necessary.
- The camera impresses with its small and lightweight housing. This puts little strain on the focuser and minimises shadowing when used with Celestron's Hyperstar.
The camera can lower the temperature of the sensor to around minus 40° ambient temperature using advanced cooling and a new housing. The temperature is controlled via the supplied DC201 control box and the camera's control software.
The difference between the ALccd/QHY 8L and 8Pro: The main difference between the two cameras is the CCD sensor. This is one of the reasons for the price difference. The ALccd-QHY 8L uses a two-stage readout process (two field readout). After exposure, the red and the first half of the green pixels are read out first, followed by the blue and the second half of the green pixels. This results in a slight colour gradient and a slight brightening in one corner of the image. Both can be eliminated to a large extent by proper image calibration (dark frames).
