Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Excellent, not perfect

This is a valuable tool, worthy of 5 stars with the usual caveats: slightly loose fit on the D200's eyepiece (a little black tape helps), the need to refocus at 2x and the current price (up 40-$50 from 2008).The DR-6 is very sharp & free from distortion -- sharp enough to show the tiny black feeds from the AF sensors seen even at 1x. It's great for landscapes, macros & manual focusing (all the better to make use of the deep pool of used MF Nikkors). Rotation is more useful than I thought at first. Another benefit I didn't expect is shooting into the sun. It's far easier to get a good view and relax one's eye muscles with a right-angle finder than the camera's own eyepiece. Sometimes the DR-6 goes on my camera for one shot then stays on most of the day. The good-quality belt pouch included is another plus.