Plano-concave lens Product Description Material: K9 Diameter: 50MM Focal length: -400MM Size tolerance: +/- 0.1MM Finish: 40-20 Surface type: Lambda / 4 Uncoated NOTE: We can also customize other size of lens, if you need, please feel free to contact us. We will arrange the shipment in 2-5 working days and it takes another 3-7 working days to reach you.
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