Reticle is usually installed on the focal plane of the right objective lens of the telescope. It is a thin piece of glass with a very thin surface engraved with the partition line, which will help to measure the length or width of observed objective.
| ATTRIBUTE | SPECIFICATIONS |
| material | N-BK7, B270 or equivalent material |
| DIAMETER TOLERANCE | +0.0, -0.1mm |
| CLEAR APERTURE | >90% |
| SURFACE FIGURE: POWER(N) | <3 fringes |
| BEVEL | < 0.2 mm x 45° |
| COATING | AR coating or customer design |