Most wedding photographers use more than one camera to capture the day's events. Often, photographers will utilize a second shooter, who may also have at least two cameras. When the images are brought into editing software, files from these multiple camera are often combined. At this point, if the dates and times of their internal clocks are not identical, the merged images will not appear in perfect time sequence, which can complicate the editing process.
In this article, I will go over the steps we take in Lightroom 5 when shooting a wedding to ensure that our cameras (usually 4 of them) are perfectly time synchronized. Although we usually start doing this prior to leaving for the wedding venue, it could just as easily be done after the event.
Using each camera in turn, take a photograph of your computer's internet browser screen showing the current time at www.time.gov.
When you return from the shoot and have imported all the images from each camera into Lightroom, use the Library Search function to display only the images from one of the cameras.
In this example, you can see that we used four different models of Nikon cameras. By clicking on one of the camera names, LR will display just the images captured with that model.
In the Library Module Grid View in LR, you should now have just the images from a single camera on the screen. If you captured the time.gov screen prior to the wedding, that image should be the first one in the Grid. With that image selected, proceed to select all the images (Cmd/Ctrl A). In Lightroom-speak, the time.gov shot should be the "Most Selected".
From the Metadata Menu, select "Edit Capture Time"
The following dialog box will appear. Make sure that "Adjust to a Specified Date and Time" is selected. Now, enter the time shown on the time.gov image as the Corrected Time. Click on Change All, and LR will adjust the capture time of all selected images to match this offset. In the example given below, the camera's clock was just 16 seconds ahead of time.gov. Thus, the time on all selected images will be reduced by the same amount.
Repeat this process for each of the cameras used on the shoot. When you have finished, make sure that Lightroom's sort order is set to Capture Time.
And you are done. The entire process can be completed in just a few minutes and is easier and more accurate than trying to set your cameras to the same time by adjusting their internal clocks. Since it relies only on determining how far 'off' each camera's time is, it can also be done after the shoot.