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Best method to create a ImageTarget

Hello, I just started development with Vuforia with Unity, before I used OpenCV Template Matching. For my use the camera will be in a fixed location with a resolution of 1280x720.  I would like to create a good imageTarget that would allow detection at different distances from the marker. Would it be better to create the imageTarget with the same camera that will be used to detect or use a higer resolution camera like my phone? Thanks in Advance.