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Crazy thing is you can buy the same sensors monochrome for industrial and astro applications but the cameras are twice as expensive. Eg Sony IMX455 61MP sensor

• strenholme 5y ago
  The cheapest I have seen an IMX455 in a new camera is $3000 for the Sony A7RIV when it’s on sale. And that doesn’t have a lens. Once one has a couple of lenses, a case, a tripod, filters, and memory cards, we’re in the $5000 ballpark. The IMX455 is an incredible hi end sensor; there’s only about three medium format sensors that exist with higher resolution—forget getting one of those for “only” $5000—but the cost of entry to have one in a usable camera is pretty substantial.