| http://www.w3.org/ns/prov#value | - Does this math work out pretty well as far as focal length is concerned on birds: *For every 10-20ft 100mm of focal length is needed depending on size to fill the frame* Size for 10ft being small birds such as sparrows and redpolls and 20ft being for larger birds such as blue herons So here goes: I am seeing a redpoll at about 40ft away, so I am gonna need roughly 400mm to fill the frame with it?
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