While it is possible to RECOVER DELETED PHOTOS from the memory-card, there is A CONDITION for this to happen successfully.
Did you delete an IMP photo from your camera accidentally, which was not meant to be?
Well, IMMEDIATELY STOP TAKING ANY NEW PICTURES FROM THAT CAMERA !
If the images have ONLY JUST been deleted, all or most of the deleted image data would be still present on the memory card and you stand a good chance of being able to retrieve the deleted photos…
BECAUSE, when you delete an image from a camera, the image itself is not deleted, it is still there, at the same memory space, only its index record of your camera’s file management system is deleted.
BUT, the camera now allows for the new images to take place of the old ones and so, if you start taking new photos just after, the deleted photos will be overwritten by the new ones, making it NEXT TO IMPOSSIBLE to be recovered by the data-recovery software.