We have come a long way in the lat few years in our ability to record what we see in a telescope. Anyone with a home computer can now capture spectacular astronomical images that would have been difficult for professionals just a few years ago. Of course, we can draw what we see, as stargazers have been doing since the invention of the telescope. This method is inexpensive enough but also has inherent flaws. Drawings depend on the vagaries of the human eye.
Many images produced by a telescope are too faint for the eye to record.
Also, the eye and the organic computer it is attached to can play tricks. Many a stargazer has seen things that simply aren't there. The biggest problem is that the eye forgets what it has just seen. Light from the stars hits your eyeball in the form of packets of energy, called photons. Photons are recorded on a sensing screen, your retina, at the back of your eye.