I bought a cheap monitor for my 5d just cause I'm not sure how much I'll actually use it. However it's pretty accurate compared to what I see on my computer, more accurate then my 5d shows. Now it doesn't have any color bars or histograms or anything. I was going to load a 1080 color bar JPG on my CF card, pull that up on my 5d and then use that image to adjust the monitor's brightness/color. Is there any reason color or luminance/gamma won't be accurate?