The Sony IMX455 sensor used in the QHY600 camera provides a number of different modes allowing the user to tailor the readout to the type of imaging that will be performed. The highest gain mode pushes the sensor to extremely low read noise and very high gain. To further enhance this mode, QHYCCD has developed an improvement that tunes the sensor beyond the factory specifications, optimizing the performance at very high gain for the cleanest possible image even at extremely high gain. To see what we mean, because the effect is quite small, the image needs to be significantly stretched to see the effect. We have optimized the readout to render this artifact insignificant. Here are the results:
To see this effect, zoom the whole image to the screen size. Set the exposure to >200ms (SharpCAP does not use software binning to resize the image when the exposure is less than 200ms and the effect is not easily seen in unbinned images). Use max gain and use the stretch function to stretch the image to the background level.