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I'm guessing you need a low light camera rather than an imagine camera. Most "night vision" cameras I've used have built in infrared LEDs to illuminate like a torch so not suitable for a telescope. So i would start by investigating the lux values of cameras, a dslr or similar that can be tethered might be suitable but it may be a guiding camera sensitive enough. either way I dont know if colour is feasible, you want low noise, possibly cooled. Wireless not likely so make sure you dont end up winding cables around a "rotating" telescope. Not sure $500 is a realistic budget for a camera.
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