Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Don't bother

I just got it. I can see absolutely no difference in the size of the image in my viewfinder. The thing DOES seem to help me with sharper manual focusing..by JUSSST a little bit. But that's not worth 40 bucks to me. Right back it goes.Think carefully about getting this. 40 bucks is a lot of money to throw down on a piece of plastic, particularly one that does almost nothing for you.