I am looking into getting a lens for my canon rebel t3. I have been told on more than one occasion and from tutorial vids on youtube that if i want to get good shots in night club, baby shower, party, etc settings i will need a lens with a 2.8 f stop. I have looked at what canon has to offer, and also looked at sigma and tamron. Sigma and Tamron are more around my price budget. I would like to know if i get a sigma or tamron lens for my canon, will they change how my pictures look vs waiting and saving for a canon f 2.8 lens?