IMHO computers and other devices at the scope are a No! No! at or near the eyepiece.
Looking at a computer screen however dull red severely spoils any dark adaption you may have.
I use a ARGO NAVIS which has the very small screen set at 4 out of 100,it is usually about 50 centimeters away from my eye,but still effects me if I am looking for very faint,Faint Fuzzies, I have to wait at least 20 seconds or more to get the object into view after reading the screen.
When I get people up here in Cambroon and watch how bright the computer screens are,I think to myself,no wonder they can't see what I see, and I have old eyes.
Cheers
PS This applies only to visual observers, most imagers just don't need to bother as their imaging area is usually lit up like Sydney Harbour.
