How would the QHY1920's large 12µm pixels perform for spectroscopy?
The large 12µm pixels are a significant advantage for spectroscopy. They offer high sensitivity and a large charge capacity (51ke-), allowing you to capture faint spectral lines without saturation. The sensor's good near-infrared (NIR) response is also beneficial for analyzing the spectral signatures of cooler stars.
Is the QHY1920's 58 FPS fast enough for solar imaging in H-alpha?
Yes, 58 FPS is an excellent frame rate for solar imaging. It allows you to capture thousands of frames in a short period, enabling lucky imaging techniques to overcome atmospheric seeing and resolve fine details like spicules and granulation on the Sun's surface. The 128MB buffer ensures none of these critical frames are dropped.
What is the purpose of the 128MB DDR2 buffer in the QHY1920?
The 128MB DDR2 buffer acts as a temporary storage space for image data before it's sent to your computer via USB3.0. This prevents data bottlenecks and dropped frames, which can occur if the host computer is temporarily busy with other tasks. It guarantees a stable and reliable image stream, which is essential for scientific measurements and video astronomy.
How does the regulated cooling on the QHY1920 help with long exposures?
The dual-stage TEC cooler reduces the sensor's temperature by up to -32°C below ambient. This dramatically lowers thermal noise, or dark current, which accumulates during long exposures. With a dark current of just 0.055e-/pixel/sec at -20℃, the QHY1920 can take clean, multi-minute exposures with a much higher signal-to-noise ratio than an uncooled camera.
What does the 0.74e- read noise of the QHY1920 mean for my images?
Read noise is the inherent electronic noise introduced each time the sensor is read out. At just 0.74 electrons, the QHY1920's read noise is exceptionally low. This means that for very faint targets or short exposures, the camera's own noise floor is minimal, allowing the faint signal from your target to be clearly distinguished.
What kind of optical systems are compatible with the QHY1920's 15mm back focus?
The 15mm back focus is a relatively short distance, making the QHY1920 easy to integrate into various setups. It works well with filter wheels and off-axis guiders that require minimal back focus. With the appropriate adapters, it can connect to standard 2-inch focusers, M54 and M48 threaded correctors, and even photographic lenses.
