Can SLR digital cameras and astronomical cameras take color photos of nebulae through astronomical telescopes?

Of course, the reason is simple. In human eyes, the sensitivity of optic nerve cells that perceive color difference is lower than that of optic nerve cells that perceive brightness, so it is difficult to see the difference when observing dim deep space objects. Taking pictures with a camera, CCD can perceive these colors by using the cumulative effect of long exposure.