The protection cap has twist-up mechanism to oﬀer the user full eye relief adjustment. The major beneﬁts of this twist-up feature is that users who want to protect their eyepiece easily can set eye-relief to their individual viewing requirements, it is also very beneﬁcial to users who require a level of eye-relief for successful smartphone digiscoping.
** Key functions:**
- Layer of protection glass to guard the eyepiece lens
- Full eye-relief adjustment with a twist-up design
- Easy to install