IMO, learning image composition relative to lens focal length/camera position is best done initially with a hand held camera digital, roll film or mobile-fone camera.. "normal" focal length lens tends to be easiest as it produces an image perspective (objects size in foreground relative to objects in the background ala at a distance) similar to the way humanoid eyes see them. This is NOT the same as two eye vision which produces a much wider perception of view than a "normal" focal length lens. This is a learned "thing" as part of fotography and image making. Not just lens/camera position, lens/camera height relative to the image to be made also figures significantly into this, optimal lens/camera position could be near ground level to greatly higher than ground level...
Few examples from the Canon digital using the basic three lens focal lengths of Wide_Normal_Tele, visual elements are noted with red or green lines with notes in each image.
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24mm @ f5.6, lower lens/camera position noted in green. size of Santa laying on this tractor in the foreground is exaggerated relative to the size of the trees in the background .. which in reality is HUGE compared to Santa on the tractor.. This is typically what wide angle lenses do and how they are most often used. Visual elements of this image are noted in red.
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40mm @ f5.6, about shoulder height lens/camera height. Note the size of objects foreground -vs- background, about similar to the way a single eye should perceive them.. visual elements noted in red, aprox lens/camera position noted in green..
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180mm + 1.4x @ f5, selective focus with the background completely out of focus working as a backdrop.. Ponder where the lens/camera position might be relative the leaf and background..
Next examples are with a view camera..
Bernice
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