HDR Timing Test

A quick test showing the delays caused by shooting HDR sequences using DSLR Remote Pro software compared to using a Canon TC-80N3 intervalometer on a Canon 7D camera. It also looks at the difference between writing the images to the computer hard drive or to a Lexar x300 CF card.

5 x 3 shot bracketted exposures (1/5, 1/10 and 1/20 seconds).

Using DSLR Remote Pro Large JPG sRAW mRAW RAW
Camera > HDD
Start 12:52:02 12:53:57 12:55:04 12:56:18
Finish 12:52:48 12:54:43 12:55:53 12:57:21
Duration 46 46 49 53 secs
Average/set 9.2 9.2 9.8 10.6 secs
Camera > Lexar CF card x300
Start 12:57:04 12:57:56 12:58:40 12:59:26
Finish 12:57:24 12:58:18 12:59:04 12:59:54
Duration 20 22 24 28 secs
Average/set 4 4.4 4.8 5.6 secs
Using TC-80N3 using 1 second interval between sets
Camera > Lexar CF card x300
Large JPG sRAW mRAW RAW
Start 14:04:30 14:05:00 14:05:26 14:05:56
Finish 14:04:44 14:05:12 14:05:40 14:06:08
Duration 15 12 14 12 secs
Average/set 3 2.4 2.8 2.4 secs

Using sRAW files from a Canon 7D the 32Gb card can hold approx 3390 images.

From the simple test using the TC-80N3 intervalometer is the method to use if you want to shoot HDR sequences as fast as possible. Using the TC-80N3 does limit a HDR sequence to 3 exposures i.e. -2, 0, +2 on Canon cameras, until Canon decide to give us more control. If DSLR Remote Pro is used the number of exposures per HDR sequence can be increased to 15 but there maybe problems with movement between exposures because of the longer time between saving each exposure.

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