EOTech CNVD-T2 Clip-On Night Vision Device - Thermal 2 - Manual (Page 28)

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2.4 LENS ACCESSORIES
Objective Lens Cover
When the CNVD-T2 is not being used, the objective lens
cover should be pulled down over the objective lens to
protect it, and internal imaging components, from possible
damage. The objective lens cover should also be installed
when calibrating the CNVD-T2 (see section 2.16).
Night Adaptive Filter / Demist Shield
When installed, the night adaptive filter / demist shield
prevents fogging of the eyepiece, and reduces backlighting
and loss of night vision in low light environments. The night
adaptive filter / demist shield is installed as follows:
1. Place the night adaptive filter / demist shield over the
eyepiece with the threaded side down.
2. Carefully turn the night adaptive filter / demist shield
clockwise to screw it into the eyepiece assembly.
3. Tighten until snug.
Eyecup
When attached, the eyecup reduces emission of stray light
from the eyepiece. The eyecup should be installed when
using the CNVD-T2 as a handheld device or when mounted
to a weapon in a stand-alone configuration. To install,
stretch the base of the eyecup into place over the eyepiece
assembly. Rotate the eyecup to obtain a proper eye socket
and cheek weld.