I want to turn DNG to TIFF, but I don't know how
Benjamin, this is a really old thread. It might have been better to start a new one. However, there are a number of ways to generate TIF images from DNG files, But actually "converting" the DNG files isn't one of them. When the files are opened in Camera Raw there is an option to save images, and one of your options is to save as a TIF file. It will be created in addition to the DNG file. The DNG file can be opened in Photoshop and then saved as a TIF file. But, again, it will be created in addition to the DNG file.