Re: I have a Nikon D7100, my computer runs mac os x 10.5.8 and I have CS5.1. What DNG converter can I use to convert the NEF files so I can open them in raw?

The D7100 was first supported in version 7.4. But you can use the latest DNG converter, or any version since 7.4. I always recommend using the latest version because it will have the latest features and bug fixes. And if the DNG specification changes the latest version of the converter will have those changes as well.