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. 2018 Jan 16;9(2):636–647. doi: 10.1364/BOE.9.000636

Fig. 1.

Fig. 1

Schematics of the optical design of the endoscope with the scanning lens, the low NA relay and collimating GRIN rod lens and the high NA imaging lens. Outer diameter was only 1 mm, the working distance 0.25 mm.