I've narrowed down my choices to 2 options for my t2i. These lenses will be paired with the 55-250 and 50 f1.8
Option 1:
1. Sigma 17-50
Option 2:
1. 18-55 kit lens + sigma 30 1.4
I currently have both the kit lens and the sigma 17-50. Trying to decide if the sigma is worth it or if I should just get a sigma 30 1.4 for low light because during the day there isn't much different between the kit lens and the sigma 17-50. Is the drop off from the sigma 17-50 to the kit lens that dramatic or will I not even notice if I use the sigma 30mm in low light situations?
I don't shoot anything specialized, just want the best all around combination.





