Before you purchase any photo recovery tool take a good look at the type of files that software supports. Almost any file recovery tool can search through a computer hard drive and locate simple image files such as jpegs. When these file types are accidentally deleted the file information remains intact on your hard drive or other digital media. It is a very simple task to use a file recovery program to scan for and locate these popular file types. But most photo recovery must be attempted on the SD card digital media in which the photo file was originally stored. And chances are that photo file will be in its original RAW file format.
RAW file types are almost always unique to each camera manufacturer. Actually better camera manufacturers such as Canon and Nikon use several different file types. Any program to recover deleted photos from SD card media worth purchasing must list your camera type as being supported.