I rarely use anything wider then 24mm so my 24-70mm lens is really all that I needed so far. Yesterday I went for the first time to do a real estate shoot for a friend as a favor. I took my wide lens which is a very, very old Sigma 18-35mm. I knew this lens isnt a great performer but I never expected it to suck as much as it did. The main problem is that any light that isnt soft and the flair on this lens is insane. The kitchen lamp had a huge hallo and the light coming from the living room window looked like a projector no matter how underexposed I tried to make the shot. I tried same shot on my 24-70mm and the picture came out perfect so it wasnt me it was definitly the lens. Anyways moving on since I never researched wide lenses I have no real knowledge about these things. In most cases I like fast glass but in this case I really dont care about that as I shoot on a tripod. So since I just finishes renovating my kitchen money is a main concern. I am looking for a wide lens for my D750, probably used or refurbished will be better and third party is good too. I am looking for 18mm or wider, zoom or prime.