Pixco AF Confirm Macro Fold Lens Bellows for Nikon D800 D800E D7000 D4 D3000 D5100 D300S With the bellows you can get up to an amazing one centimetre away from your subject. Flex(mm): 37-144 Photography zoom (change to standard lens to f50): 1/1.3x-2.86x With 1/4' tripod screw The bellow is an accordion-type section which is inserted between the lens and the camera body and extends the lens-to-film distance thus improving the quality of your macro photography.