To use the tethering feature, you must connect your camera to your Mac via a USB or Firewire cable. Then choose File > Tether > Start Session. The Tether HUD will appear, which offers many of the same controls that you find in the Import dialog box.
Definitely for the pro. One advantage I can see is that if one is shooting and then printing each shot out immediately on site, such as pictures of Santa and kids, you don't have to pull the SD card out, wait for it to load with all the pics on it, then transfer the file so you can print it out for the waiting customer, then unmount it, and put it back in the camera, rinse and repeat. Instead you could just shoot and print, shoot and print. While you're shooting the pics can be in the print queue printing away.
You can also immediately see for yourself full size on the screen instead of on a small camera display, or ask the subject you're shooting how they like that shot . <----Get it now? j/k
Not something you'd want to cart around on a hike in the woods or anything of course.
Carp.. you can't see squat on the little camera lcd... whereas you can everything on your Macs screen. If I am shooting models I don't want to have to squint and see if their eyes are really open or if they were blinking in the shot. I can also see if my focus is spot on...and a number of other issues. I can't see detail on small items like I can on a large screen.
Yes, we were using a tethered camera on my job a couple of years back, taking product shots, and it speeds the process up immensely - you can shoot, tweak or discard and shoot again, very quickly, then when you have the pic you want to keep you can just rename the file, store it and move on to the next one. Much less hassle than processing a batch of photos later on called IMG000234.jpg or whatever. Also, the software we were using let you batch process, i.e. save the image in several different dpi/sizes at once to different folders.
_________________________ If it's brokenless, don't suffix it...