I am looking for a wide angle lens and leaning towards the Tokina AT-X 11-20mm F/2.8 or Tokina AT-X 116 PRO DX II AF 11-16mm f/2.8 lens I am not sure if this lens is right for me because of the f/2.8 I can see this very handy for night landscape and shooting indoor rooms in dim light (which i will do) but i have a passion for landscape photography (mountains,waterfalls, open fields) so wouldn't the f2.8 blur things in foreground and background? and let too much light in? and if not should i just use a filter to make up for the wide aperture in daylight? What can you suggest? this lens is about my budget at this stage but open for suggestions and willing to save extra if the extra money will give me a much better lens. and what about the sigma 10-20 f3.5 EX DC HSM? I i have been using the 650d science release and iam going to upgrade my body and thinking about getting the 80d or 7d mark 2.