Sigma, Tokina and Tamron all produce zoom lenses with the range of 24mm all the way to 70mm at f2.8. Some are 24-70, some are 28-70.
Which is the better breed of all? Taking:
1: Optic quality (sharpess, build quality and of course, the extra 4mm at the wide is good news for DSLR)
2: Build quality (during AF, does the focus ring turns? because it might hinder me when i'm holding the lens)
3: Others (which i might have missed out)
**note: Price is not so much of a concern.
Which is the better breed of all? Taking:
1: Optic quality (sharpess, build quality and of course, the extra 4mm at the wide is good news for DSLR)
2: Build quality (during AF, does the focus ring turns? because it might hinder me when i'm holding the lens)
3: Others (which i might have missed out)
**note: Price is not so much of a concern.