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"RE: Question - How to for D3100"
Looking at your picture, I see that your focal length is 300mm with the speed set to 1/125 sec at F5.6.If you are hand holding, you are not going to get sharp results with those settings. I would sugguest that you set your speed to greater than 1/300 sec. You might also want to use VR. The best option to get a sharp image with those settings is to use a tripod. That's my opinion for what it is worth.Happy shooting
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