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Message: <blockquote data-quote="tdodd" data-source="post: 1870413" data-attributes="member: 55450">If you're shooting hand held with an unstabilised lens then the rule/guideline of minimum shutter speed = 1 / (focal length x crop factor) works as a good yardstick when making a 10" print. It is likely to fall apart when viewing a virtual image on screen that is more like 30"-40" in width and if that is how you intend to view and judge your results you either need to stand back to view from 3'-4' away or be prepared to increase your shutter speed by 3X to 4X more than the old guideline suggests. Thus a 400mm lens on a crop body with a 1.6X crop factor might need a minimum shutter speed of 1/640 for viewing as a 10" print or on screen as a 10" image. At 20" (real or virtual) you might be looking to shoot at 1/1250. For a 7D file viewed at 30-40" across it makes sense that the minimum shutter speed for a high success rate would be in the region of 1/2000 or more. Of course, practice and experience can bring those figures down, but inexperienced shooters waving a 7D about with a long lens attached may well be disappointed in their results. I know I have had to improve my game since getting the 7D and I'm pleased to say the results are paying off.</blockquote>