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Okay so I am an intermediate photographer at best so please be patient with my question and thanks in advance. My question is, is there a model/calculator whose results will give you the percent of a frame you will fill, without cropping, based on target image size, distance, zoom level lens type etc. i.e. say you have a elk at 300 meters and you are using a 200-600 zoom lens zoomed to 600 what percentage of the photograph with the elk image take up? Again thanks much for you patients and input.