i have been using an iMac for the last 5 years, so i never noticed this before. Just got a new MBP last week, and notice that between my monitor and the computer screen, there is a difference in the "aspect ratio" (for lack of better description). Here are two pictures to explain what i am seeing. First one is LR when working on the 27" screen, and second one is on the MBP. The amount of "frame" around the photo is not the same. just wondering why. If i choose "2:1" viewing in navigator, it helps a bit, but still way small.