Demist shield and sacrificial window

3.To detach the current lens: hold the lens by its base and rotate it counter-clockwise. Once the lens has been removed, store it in a safe, clean space.

4.To attach desired lens: rotate it clockwise along the threading until snug—do not overtighten.

The threads are very fine (to prevent humidity penetration) and can be damaged easily. Do not apply force when rotating the lens. If the desired lens does not rotate smoothly along the threading, make sure that the threads are aligned.

The Unit is ready for operation immediately after the lens change. During operation in brightly lit spaces, ensure the objective lens cap is in place.

Note: Demist Shield and Sacrificial Window are optional.

The sacrificial window protects the objective lens from sand, dust and other objects that can scratch or otherwise damage the lens. The sacrificial window is affixed on the objective lens in place of the tinted objective lens cap which comes installed on the Unit.

The demist shield filter protects the eyepiece against fogging. To install it fold the eyecup down, in order to access the thread, and screw the filter gently onto the eyepiece.