Leitz microscope objective lens. 25x - .50na achromat; 170 t.l., 0.17 coverslip. This is optically corrected for a 170 tube length system, but it's for the newer versions, with a par focal length of 45mm (the same as 160 tube length systems). Excellent optical condition, with retractable tip. A magnification level convieniently between 40x and 10x. A very nice and useful lens. Excellent condition. Sold used, as is. Sales and shipping to USA only. Payment by Paypal only, and must be received within three days. Fixed shipping to USA $8.00. Thanks for looking!