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@thomasfuchs @hendric @jdlbt Oh wow, I thought you need a way longer focal length to capture that much detail! Is there a particular star tracker you can recommend? Although @raspberryswirl's suggested DIY star tracker makes me want to make my own, but I did some calculations and getting enough accuracy might be a challenge.
Camera lenses with high focal lengths seem to be expensive, is there a specific refractor you can recommend?