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. 2014 Nov 24;5(12):4350–4361. doi: 10.1364/BOE.5.004350

Fig. 6.

Fig. 6

Step responses of the vari-focal objective lens. black line - vari-focal objective lens; and blue line - vari-focal objective lens with a 1.52 m tube with an ID of 0.86 mm. ta and tb show the 10%-90% response times for the vari-focal objective lens w/o and w/ the 1.52 m tube.