I have a set of scanners from very expensive to really cheap. The really cheap one contains a 5MP camera and stores images to SD card. On perfectly exposed slides & negatives it does a pretty good job and it's very fast. It's a complete pain to keep dust-free, though, and it does a poor job of dense slides/negatives. For serious stuff, I use a Nikon with slide feeder and Hamrick Vuescan.