Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Slide copier or door stop?

I recently purchased this Opteka HD Slide Copier for Canon EOS Digital SLR Cameras. I bought it to copy the hundreds of 35mm slides I have. Unfortunately, this copier has a square opening in its slide holder, and the rectangular image of a 35mm slide is partially covered on the ends (or top and bottom). It cannot be used to properly copy a single one of my slides. An email to Opteka seeking a solution to this problem has gone unanswered.If you are looking for a doorstop, you can do better.If you are looking for a slide copier, you can't do worse.