I'm not an active member but LOVE learning from the posts. I take photos for seniors, families, etc. I was wanting more of a wider lens to capture lots of background in the photo. (Heck maybe could even use on vacations...is it too much to ask?? ) I know not to use them on portraits too. I have the canon 70-200 2.8 IS, and canon 50 1.4 mm. Was wanting something that would complement these. Someone mentioned the Canon 10-24mm. Looking on Amazon the 17-40L popped up. What do you think would work the best? Let me know what you use.