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Peter Emmett  > Photography > Guide Number Reference > Guide Number Shots
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 7a
This shot was taken with a two strobes:
1) camera right, using a reflective umbrella @1/8 power and @50mm zoom.
2) camera left, bare light @1/64 and @24mm zoom.

Although this wasn't too bad as a starting point I felt the the left strobe was too bright and I would have stopped in down 1 stop.
Shot 7b
This is the same shot as 7a but the left strobe was decreased by 1 stop and re-shot: 
1) camera right, using a reflective umbrella @1/8 power and @50mm zoom.
2) camera left, bare light @1/128 and @24mm zoom.

I feel that this would be a good starting point for a shoot.
Shot 7c
This is the same shot as 7b but the I changed the settings on the left strobe but still aimed to get the same amount of light: 
1) camera right, using a reflective umbrella @1/8 power and @50mm zoom.
2) camera left, bare light @1/32 and @14mm zoom.

You can see that the background is more lit than 7b, due to the wider angle of light, but I am lit pretty much the same as in 7b.

I feel that this would be a good starting point for a shoot.
Shot 7d
This is the same shot as 7c but the I added an 8" Honl Snoot without changing any settings to test the theory that a snoot won't change the amount of light just the coverage: 
1) camera right, using a reflective umbrella @1/8 power and @50mm zoom.
2) camera left, bare light @1/32 and @14mm zoom with an 8" Honl Snoot.

You can see that the background is much darker than 7c, due to the snoot and the narrower angle of light, but I am lit pretty much the same as in 7c.

I feel that this would be a good starting point for a shoot.
Shot 7e
This is the same shot as 7d but changed the snoot to a Stofen diffuser and recalculated the settings: 
1) camera right, using a reflective umbrella @1/8 power and @50mm zoom.
2) camera left, bare light @1/64 and @70mm zoom with a Stofen diffuser.

You can see that I am lit pretty much the same as in 7d.

I feel that this would be a good starting point for a shoot.
Shot 7f
This is the same shot as 7e but I added a pink filter to the Stofen diffuser and recalculated the settings: 
1) camera right, using a reflective umbrella @1/8 power and @50mm zoom.
2) camera left, bare light @1/16 and @28mm zoom with a Stofen diffuser.

You can see that I am lit pretty much the same as in 7e.

I feel that this would be a good starting point for a shoot.
Shot 7f
This is the same shot as 7e but I added a pink filter to the Stofen diffuser and recalculated the settings:
1) camera right, using a reflective umbrella @1/8 power and @50mm zoom.
2) camera left, bare light @1/16 and @28mm zoom with a Stofen diffuser.

You can see that I am lit pretty much the same as in 7e.

I feel that this would be a good starting point for a shoot.
Shot 7f
This is the same shot as 7e but I added a pink filter to the Stofen diffuser and recalculated the settings: 
1) camera right, using a reflective umbrella @1/8 power and @50mm zoom.
2) camera left, bare light @1/16 and @28mm zoom with a Stofen diffuser.

You can see that I am lit pretty much the same as in 7e.

I feel that this would be a good starting point for a shoot.
Shot 7f
This is the same shot as 7e but I added a pink filter to the Stofen diffuser and recalculated the settings:
1) camera right, using a reflective umbrella @1/8 power and @50mm zoom.
2) camera left, bare light @1/16 and @28mm zoom with a Stofen diffuser.

You can see that I am lit pretty much the same as in 7e.

I feel that this would be a good starting point for a shoot.
Canon EOS 30D |
More details: exif |
Original size: 2336x3504 |
Current: 400x600 |
filename: 20080523_GN_calculation_015 |
Share photo: links, forums, blogs |
Keywords: peter umbrella emmett 8 1 2008 50mm calculation guide number gn emmettphotography.blogspot.com www.emmettphotography.com
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