DescriptionA 13-15yr old horse lens laser focus.png
English: Two horse lenses from an approximately 13-15 year old horse suspended on water by cling wrap with 4 approximately parallel lasers directed through them. White grid pattern at back is at 1cm spacing. The focal length of the lenses is therefore approximately 6 cm. The lenses themselves appear to be 5cm diameter and 3.5 cm thick.
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