Some basic information, I am sure you may receive more specific solutions.
Assuming it's either an SD or CF type card in the camera.(I am sure other types may be recoverable as well)
If you have not used the camera since the "Download " then you should be able to recover the Pics.
If you have used it since then you will loose some of them dependant on how many subsequent Pics you may have taken .
I had two C/F cards from a photo. trip to Belgium , lost when my first level back up Hard drive went U/S. I had not transferred them to my secondary back up H/D.
Googled to find lots of free recovery software.
Managed to recover the pics from the C/F cards ok very easy.
Note, I did loose a small No of pics on one of the cards as I had taken a small No of Pics on one card after I had downloaded them .
Hope this may be of help.
OPF
Last edited by Old Photo.Fanatic; 20th May 2010 at 15:01.