My studio test shots came out relatively dark, my settings:
  
  1/125, f/8, ISO200 with Nikon D90, 60mm prime lens, SB-910 speed light.
  
  How do I get brighter result without changing the shutter speed, aperture and ISO?
  
  I wish I have a studio and experience all by myself:(
  
  Your professional advice is greatly appreciated:)
  
  Thanks a million!
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