Hi,To find the an object distance (working distance) in an image, I can do this
object distance = focal length*((1/magnification) + 1)
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hi, first Your question is not clear? second, on a single image you can not extract object distance,=> you need stereovision, or other techniques like depth from focus or special cameras( Time Of Flight) I suppose you refer to the thin lens equation but this is only for an object in focus