View Finder Glare on the D600
You need an LCD hood. There are lots of options out there, ranging from inexpensive "sun shades" to quite expensive eye piece style hoods that can magnify. If you just want to be able to see in the sun light the shade style will work. You could DIY a solution pretty easily too.
|Sophisticated construction by the nature by Orchideon|
|After the Rain by Flor Tempra|
from Macro - Something Pink
|Asilah by Limburg|
from Cozy Corners