Howdy @nayan - With the Raynox DCR-250 attached to your 50mm f/1.8, you have to get extremely close to the subject...probably within 1 to 5 inches before autofocus kicks in. I would also set your AF Mode to One-Shot (see page 66 of the T2i manual) and your AF Point to center (see page 68 of the manual) so that you can pinpoint exactly where you'd like to focus. Happy shooting! :)
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