Summary: Nikon Slide Copy Adapter
Comment: The Slide Copy Adapter (ES-E28)is shaped like a 35mm lens, but slightly larger. One end screws onto the Coolpix lens (despite Amazon's Editorial Review, I do not require a step-down ring for my Coolpix 950), the other end is a frosted plastic sheet that allows light to pass thorugh. There's a slot in the side of the Adapter where you insert a plastic holder for slides or negatives. These come with the adapter.
Amazon and many other websites have shown a boxlike device in the past few months. I don't know what this box is, but it looks nothing like my slide copy adapter (note model # above).
Once you've inserted the slides in the holder, and put it the slide holder in the adapter, you crop the image as desired using zoom and press the shutter. The instructions come with prefered camera settings for best results. For best use, you need a light box to backlight the slide evenly. It may work outside, but I haven't tried that as it's a little cold in Chicago in February.
It works well, but I wish there were covers on each end for storage. The frosted plastic could easily scratch or break in a camera bag and the opposite end is open, which allows dirt inside the adapter after a time. I'm getting a cloth lens bag for mine.
If you get one of these, I'd recommend a AC Adapter also.