I have an old Canon 450D, which is full spectrum, cold finger cooled, and it does well at dark sites. It is a bit power hungry because of the cooling, but once the sensor is below 0C the image is very smooth and noise free. You need to decide if modding a DSLR is for you. I believe the emergence of the relative lower cost CMOS mono cooled astro cameras like the super low noise ASI1600MM-C and the QHY variant, has put a dent in the DSLR mod world, simply because they are so good.
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