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  1. J

    Focusing with 100-400mm lens and Canon 7D

    One feature to mention explicitly is the per-lens focus adjust. I put a focus target on a board tilted away from me and test for front-focus and back-focus. here's a website with the chart I use. http://focustestchart.com/focus21.pdf. there's apparently a new version I haven't worked with, but...
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