This is my first SLR (350d) so I may be even asking the wrong question or there may be a much easier solution instead of spending money. Got a copy of the 50mm 1.8 on a 350d and finding it a little problematic for my use. Basically getting a significant percentage of out of focus shot (seems to focus a little further back a lot of the time), maybe because the low light indoor situations and AF is not coping. I need to keep the lens on low F with faster shutter because of subject unpredictable fast movement (baby). Also because of the possible irractic fast movement, baby can move out of focus and the AF on the 1.8 isn't very fast neither. With such shallow DoF, it becomes a bigger problem. Can get some great shots every now and then but the hit and miss is winding me up bad. (seeing some shots with lovely baby smile but out of focus etc...) The focusing on the lens seemd OK as I tried it on a tripod with objects in good light and the focus is fine. The questions are: 1. Is the 50mm f/1.4 sharper at the lower F range? 2. Is the 50mm f/1.4 better on the AF on a 350d in low light (AF accuracy)? 3. Is the AF siginificantly faster becasue of the USM? 4. Should I save a bit (LOT) more and go for the 35mm 1.4? It seems to be a better FL for the job but the £ is holding me back. Is there a good 3rd party alternative (sigma etc)? 5. Do I just live with the high percentage of write off as this comes with this type of shots. Is the spending going to be worth while? Any help and suggestions on related issues would be appreciated.