Yesterday I was at Point Lobos shooting a variety of wildlife, nature, and landscape subject. As I worked I found myself using the live view feature of my Canon EOS 5D Mark II very frequently – partly for reasons I’ve written about before, but largely for two reasons that I’d like to briefly mention.

Much better depth of field preview – Everyone knows about the small depth of field preview button on the body near the lens. Since the lens is open to the widest aperture when you focus you cannot tell what your depth of field will be until you push this button to stop down to the aperture that you’ll use for your shot. There are two problems with this technique: you cannot judge sharpness critically enough across the frame in the viewfinder and the viewfinder becomes incredibly dim if you stop down to small apertures like f/16. Put those two problems together and the usefulness of the preview button is diminished. However, when you use live view the camera automatically adjusts when you press the preview button and the image is still plenty bright to see on the LCD. Even better, you can zoom in to 5x or 10x magnification to carefully check sharpness. All in all, this makes DOF preview a much more useful feature when live view is used.

You can compose a photograph when using neutral density filters to extend exposure – At one point this weekend I was using a 9-stop neutral density filter to make exposures of the surf with durations in the 10-20 second range. My usual practice is to compose the shot and, if necessary, manually focus without the filter attached. Once the shot is set up I attach the filter. Unfortunately, the filter renders the scene virtually invisible through the viewfinder. Recomposing or manually focusing requires removing the filter, making adjustments, and then reattaching the filter. I discovered yesterday that live view mode can display the image in the LCD even with my 9-stop ND filter in place, allowing me to make changes to the composition/framing or adjust focus without removing the filter

(Shortly after posting this I got a message from B&H photo saying that they again have the Canon EOS 5D Mark II back in stock, and unlike some other dealers they sell it with no markups at the list price of $2669.95.)