SUP21S Installation of protective/focusing lens

Note:

1. Please pay attention to the site environment when replacing, and it is recommended to use paper tape to prevent dust.

2. The specification of the protective mirror sealing ring is: 15*21*2.7.

3. The default specification of protective glasses is D18*T2.

4. The default specification of the focusing lens is: D20 4.5 F150.