I will admit I don't use my super wide angle Sigma 12-24mm
f4.5-5.6 a whole lot, but a recent visit to Casa Loma, the magnificent early
20th century castle in Toronto, seemed like the perfect opportunity to pull it
out. This lens is the widest zoom lens
in production for full frame cameras, allowing an incredible 120 degree
rectilinear view.
Though this lens is fairly slow at maximum aperture, the
ultra wide angle means that you don't have to worry too much about shake, even
at shutter speeds as low as 1/8th a second. At this shutter speed at 3200 ISO,
as room is quite dark. The other thing
about this lens is that you dont have to worry too much about focusing - almost
everything is always in focus.
A rather interesting quirk is that this camera lens
combination tends to underexpose scenes inside (particularly those with a
bright light source, like a window) quite dramatically. One photo I have to add +3 stops on exposure
compensation to get the correct exposure.
Outside there were no issues.
Overall it is a good lens, reasonably sharp and not too much
distortion. The corner quality does drop
significantly wide open at 12mm, but this is to be expected. 12mm does give an unusual perspective on an
object, and for this alone having the lens around is worth it.