Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Seagull Right Angle Findeer

I bought this to use on my Canon XTi to take pictures through my telescopes. It has served that purpose well. It is easy to install and the built in magnification is a big plus in focusing on stars. Construction is very good and the fact that the eyepiece can be rotated is a big plus. Anyone taking pictures through a retractor telescope needs this accessory. I highly recommend it.