if you are a canon user then you need capture one. tethered allows you to shoot and see the image right away, then you can make adjustments on the capture one program to fine tune and reshoot. such as checking focus, just change it in the software and reshoot with a keystroke. Use it for catalog shooting all the time, highly recommend it. I have also tethered pentax and it is not the same. it just allows you to see the image (not a very big view) and all the file info on your monitor. you can not make adjustments on the software side. that is why you do not hear much about it. just as quick to pull the card and upload to the pc/mac
