Question Is there frequency correction regarding red-shift?

Apr 28, 2021
It is a well-known fact that the universe is expanding. This means that the farther we look in the universe, the farther speed away the objects there are from us. In this case, based on the Doppler Effect, the frequency of electromagnetic waves will be slide in a lower region.

This means that when you look at to a certain distance with the optical telescope, the colors shift, because of the Doppler Effect. As a result, the color of the image you see will not be correct.

On the other hand, if we look at a much more distant region, the optical light could slide to infra-red region totally. In fact, the result is that optical light from this region will be invisible when viewed through an optical telescope.

My question is, do astronomers use any kind of equipment to correct this error?