There shall be only 1 standing in the end (L-R) Tamron 17-50 f2.8 vs Sigma 24-70 f2.8 vs Canon 24-105 IS F4 L
The Tamron 17-50 f2.8
Sharpness: Sharp (4/5)
AF Speed: slow (3/5)
Low light AF: (5/5)
Usable range for event: (4/5)
Sigma 24-70 f2.8 DG Macro
Sharpness: Sharp (3/5)
AF Speed: slow (4/5)
Low light AF: (3/5)
Usable range for event: (3/5)
Canon 24-105 IS F4 L
Sharpness: Sharp (5/5)
AF Speed: slow (5/5)
Low light AF: (4/5)
Usable range for event: (5/5)
Stobe info: Nikon Sb80DX on cam right at 1/32 @ 24mm Canon 580 EX II on cam eTTL.