Posted by DawnPatrol I don't think I really understood what you were referring to when you mentioned it in avchat, but now that I look at the pictures I get it. I was shooting some stuff at night with my Canon 50mm 1.8 and had that issue as well. I'll be curious to try a smaller aperture and see if that makes any difference. I don't have this issue with any of my other lenses.
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Few lens shoot well wide open. The 70-200 f/2.8 IS one exception; it's tack sharp wide open and just fantastic.
To spite it's bad reviews, I had the 50L and shot it wide open a lot with good results. Still it was much better stopped down if you had the light and didn't need the narrower focal field. Wide open this lense had superb flare resistance and night shooting was a blast with it. Something the reviews shamelessly tend to overlook.
Stopping the 50 f/1.8 down to f/2.8 - 4.0 will improve the image quality substantially at the cost of light gathering ability. Shooting wide open is one of the reasons to own fast lens and many times they require more expertise to milk the most out of them. For a Franklin you can't bitch too much about this prime, a lot of bang for the buck.
One thing the L lenses have is more aperture blades which renders them more flare resistant and better bokeh. Too many forget about that dreamy background blur and pop out image a fast, expensive lense can capture even when the subject is heavily back lite. It's not just for low light, and faster AF locking that you buy a high dollar lense.