From the dog training that I go to, I tried the 70-300 on my 1DS3 using 3 flash - 2 580 removes and a 430 on the camera.
Shooting Mode Manual Exposure
Tv( Shutter Speed ) 1/250
Av( Aperture Value ) 7.1
ISO Speed 1600
Focal Length 300.0mm
IMG_9971_1x.jpg
Shooting Mode Manual Exposure
Tv( Shutter Speed ) 1/250
Av( Aperture Value ) 7.1
ISO Speed 1600
Focal Length 300.0mm
IMG_9994_1x.jpg
Shooting Mode Manual Exposure
Tv( Shutter Speed ) 1/250
Av( Aperture Value ) 7.1
ISO Speed 1600
Focal Length 300.0mm
IMG_9971_1x.jpg
Shooting Mode Manual Exposure
Tv( Shutter Speed ) 1/250
Av( Aperture Value ) 7.1
ISO Speed 1600
Focal Length 300.0mm
IMG_9994_1x.jpg
Comment