Nikon D300 - Manual (Page 46)

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The DK-23 Viewfinder Eyepiece Cup
Before attaching the DK-5 viewfinder
eyepiece cap and other viewfinder
accessories (pp. 89, 366), remove the DK-23
viewfinder eyepiece cup by placing your
fingers underneath the flanges on either side
and sliding it off as shown at right. The DK-5
viewfinder eyepiece cap is used in self-timer
(pg. 89) and interval-timer photography (pg. 189).