Guide Number Shots - # - Capturing moments that lasts forever

This set of photos was done to test the article that I had written about using Guide Numbers to get a first shot pretty close to the correct exposure. The article I wrote is here - http://emmett-photography.blogspot.com/2008/05/guide-numbers-canon-580ex-ii-and-430ex.html

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Shot 1a
This shot was taken with a single strobe camera left, using a reflective umbrella @1/8 power and @50mm zoom. I read the wrong number for the wrong chart (2*580 GN number) which means it was shot at -1 stop.

Shot 1b
This is the same shot from Shot 1a, but I have increased the exposure by 1 stop in Adobe Lightroom. I feel that this would have been a good starting point for a shoot

Shot 2a
This shot was taken with a single strobe camera left, using a reflective umbrella @1/8 power and @50mm zoom. This time I read the right chart and you can see that the exposure is similar tot he adjusted Shot 1b

Shot 3b
This is the same shot from Shot 3a, but I have increased the exposure by 1 stop in Adobe Lightroom. I feel that this would have been a good starting point for a shoot

Shot 3a
This shot was taken with a single strobe camera left, using a reflective umbrella @1/8 power and @50mm zoom. I read the wrong number for the wrong chart (2*580 GN number) which means it was shot at -1 stop.

Shot 4b
This is the same shot from Shot 4a, but I have decreased the exposure by 1 stop in Adobe Lightroom. I feel that this would have been a good starting point for a shoot

Shot 4a
This shot was taken with a single strobe camera left, using a reflective umbrella @1/8 power and @50mm zoom and ISO200.

I calculated the guide number to be -3 stops and it should have been -2 stops.

I used the wrong calculation and over exposed by 1 Stop

Shot 5a
This shot was taken with a single strobe camera left, using a reflective umbrella @1/8 power and @50mm zoom.

I calculated the guide number to be -2.5 stops and I feel that this would have been a good starting point for a shoot

Shot 6a
This shot was taken with a single strobe camera right, using a reflective umbrella @1/8 power and @50mm zoom.

I calculated the guide number to be -2.5 stops and I feel that this would have been a good starting point for a shoot

For a really good starting point I would have changed the model (me) :-)

Shot 1a
This shot was taken with a single strobe camera left, using a reflective umbrella @1/8 power and @50mm zoom. I read the wrong number for the wrong chart (2*580 GN number) which means it was shot at -1 stop.