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 |