in PlayerOne Poseidon , 71 ke full capacity available right from the beginning in ASI 2600MC Pro, cloudynights apr 2023 now ZWO added the "extended full well mode" to 80 ke- full well, to ASI2600MC Pro ONLY ( IMX571 sensor), and 15 FPS ( raw8) in Touptek, INDILIB forum in QHY268 IMX571 QHY offers four readout modes for the 268: 0 (photographic mode) amplifier switch to lower noise at gain=26 1 (high gain mode). amplifier switch to lower noise at gain = 56 2 (extended full well mode). Higher noise, but full well around 80Ke- 3 (extended full well mode 2CMSIT) Full well around 80Ke-, but readnoise 1.3x lower than mode 2 For mode 1, HQA measured 2.85e-/ADU readnoise at 0 gain setting. This yields a system gain of 0.77e-/ADU, and a linear full well depth around 62K counts or 48Ke-. He considered this the best combination for photometry, as fairly short exposures will have enough sky signal in broad-band filters that the sky noise will dominat...