When acquiring any exposure, regardless of the duration of the exposure, the sensor will generate some noise. Some of that noise is electronic randomness which can be eliminated by subtracting bias frames. Some noise is actually signal generated by the chip. Dark frames are used to remove this unwanted signal. I immediately noticed how much of this thermal signal was present when I first started my deep sky experiments with the ASI174MM. I'd like to say that this is my original idea, but I actually saw people doing this hack with DSLR and other cameras. It was clear that I would be able to quickly and inexpensively come up with my own cooled ASI174MM camera hack.
Find Us On Social Networks Here