No alternative 1

For APS-C cameras there is no comparable wide-angle, which goes down to 8mm. The difference to the otherwise attainable 10mm is not to be despised and was relevant to the decision for me, along with the good tests. With the image quality I am completely satisfied, I find my copy already at full aperture very useful. Of course, that part is not particularly bright, which personally does not bother me because I'm usually in sufficient lighting conditions on the road, the permit rule f8 with ISO 100 - with 1/13 you can still loose freehand pictures without shaking. Otherwise but a tripod is already in dark rooms with wide-angle lenses generally strongly recommended. So I do not see as a real negative point or you knew that beforehand.

The inability to use except for 16mm filter, I do not find serious as at wide angles the use of polarizing filters is not really useful anyway. The cover consists of two parts by the way, because in one part is a filter thread and you can just work so theoretically at 16mm basically vignetting with filters.

The build quality is good; the lens feels stable and high quality.

What I did not like so much, is the top end with only 16mm. There's a Sigma 10-20 rather more to use than "Always top" or "Oftdrauf". Also this Sigma costs 8-16 good 230 more than the Sigma 10-20 F4-5.6 or 130 more than the Sigma 10-20 F3.5. But even these points I would not hold against you because its so is aware of previously. It is holding a special lens. This is used sparingly, but then allows real Aha! -Photos In the appropriate situations.

So if you like me are looking for a wide-angle for landscape and Städteaufnamen traveling during daylight hours and the maximum angle of view would, in my opinion, can safely access, provided that the budget permits.

Regards