2.8 Glass. MEANS YOULL SPEND 2.8 TIMES THE MONEY ON THE GLASS. :er: AAA. I know the 2.8 is a faster glass. For you newbies who arnt a master photgraffer like myself. LOL! Fast glass means better images in lower light situations. I know not only is this type of glass needed for wedding photographers. Because of church restrictions and low light banquet halls. But Ive heard this theory is so strongly backed up that it I feel confident that it is worth spending the extra "2.8 money" BBB. Experts correct me if Im wrong. But Im led to believe a 2.8 compared to a 4.5. Now this is probably a obvious thing but. WHAT EVER! It also allows you to set your aperture from 4.5 to the lower 2.8 setting giving you more control of the blurred background. I have another thread pertaining to this. Although this topic is very similar to, it the ending question is still different. How much more blur control do you get over the background? Is there really that big of a difference? If I didnt need it for low light situations and only wanted it for more background control. SHOULD I STILL SPEND THE EXTRA MONEY AND BUY IT? Im trying to determine whether spending the money on newer 2.8 glass is worth it. Will I be 2.8 times as impressed with the background control?