rkkwan wrote in post #10805543
First about some misinformation I read in this thread. Forget using a filter on the Sigma. If you leave that plastic ring on the lens, you'll find vignetting even at 16mm, and basically looking through a circle at 8mm.
since that's aimed at me I'll reply. You CAN use filters on the 8-16mm and had you clicked my link you'd see how. I did preface that comment with it being a PITA, but it IS possible. I've done it with the 12-24mm on FF and nikon's 14-24mm as well (much bigger lens even if it's "only" 14mm)... Watch this video, it'll show you how:
Also, the Sigma is not big and heavy. It has the smallest diameter and is the easiest to carry around among the three lenses, especially if you add the mandatory hoods of the Canon or Tokina. It is also lighter than the Tokina.
as for the size/weight, it's got the smallest diameter sure, but it's the longest and it's heavier than all but the tokina:
8-16mm: 550g 75x105mm 7875
10-24: 410g 83x84mm 6972
10-20: 3.5 520g 87x88mm 7656
10-20v: 460g 84x81mm 6804
10-22: 380g 83x90mm 7470
11-16: 560g 77x89mm 6853
if you go by the volume (assuming the lenses are perfect cylinders, which the siggy is close to but the others are not) the 8-16 is the biggest lens there and it's the second heaviest. So yes, I stand by my biggest and heaviest remark, OK, I was slightly off on heaviest but it's still very close to right.... They're all relatively small/light, but the weight is a pretty big difference between the canon and the 11-16 and 8-16mm for me. The 10-22 is comically light really.
and just FYI, I've owned the 12-24mm version, the 11-16mm and the 10-22, so I'm familiar with 2 of them personally and the 8-16mm is VERY similar to the 12-24mm in design.
as was mentioned in another thread though, the 10-20 works with a 1.4 TC on FF. I'd love to see how the 8-16mm and 10-22 act with the same TC. You need the tamron TC because it's element is recessed and I'd bet the 10-22 needs and EF conversion (mine has been done) but I'd be curious to see how the 8-16 holds up as it'd be a 11.2-22.4mm. Slightly wider, but it's sharper in the corners so it'd be fun to see if it could hold that sharpness with a TC in the mix. I'm considering swapping some lenses around here to get a 5Dc and 1.4 TC myself so I can see how it does. The 10-22 would be a 14-31mm, but what could be really fun is if it still takes panel filters via the threads in the front... 14mm with normal old panel filters and possibly less distortion than the 17-40? Yes please, but a pipe dream as well. I know the 10-20 works on FF and looks pretty damn good stopped down though so it's not impossible.