Multiple Exposures with the 5D Mark III

I haven't taken the opportunity to play with the multiple exposure mode on the 5DIII yet but I used to enjoy using this technique with my old Minolta X-700 film bodies. With the X-700s you had to hold the film rewind button while moving the film advance lever so that the camera thought film was being advanced but it (mostly) stayed in place. You had to reduce exposure by one stop for each of the two exposures and you would get a properly exposed image of the two subjects.

With the Canon 5D Mark III, there's a multiple exposure mode that has lots of options but I chose the simplest - two images, combining exposure. The camera saves the two RAW files and combines them into a third RAW file, saving the original two. The one thing you can't alter in the combined file is white balance so care needs to be taken that it's accurate rather then relying on auto.

In the following instance, the auto white balance was a little cool and when I switched to cloudy in the DPP software for the individual files it was better. The multiple exposure image was stuck with the auto white balance, though, so I boosted saturation a bit to compensate. The single images have WB corrected to cloudy.

EF 100mm f/2.8 Macro at f/8, 1/180 sec., ISO 800

EF 100mm f/2.8 Macro at f/8, 1/125 sec., ISO 800