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Reticle

08 Nov 2019

A reticle, or reticule (from Latin reticulum, meaning 'net'), also known as a graticule (from Latin craticula, meaning 'gridiron'), is a pattern of fine lines or markings built into the eyepiece of a sighting device, such as a telescopic sight in a telescope, a microscope, or the screen of an oscilloscope, to provide measurement references during visual examination.

 

Both terms may be used to describe any set of lines used for optical measurement, but in modern use reticle is most commonly used for gunsights and such, while graticule is more widely used for the oscilloscope display, microscope slides, and similar roles.

 

Specifications

 

Material:

N-BK7, B270

Diameter:

+0/-0.05mm

Clear aperture:

>80% of diameter

Thickness:

+/-0.1mm

Parallelism:

< 1 arc minutes  

Surface quality:

60-40 scratch and dig

Flatness:

2λ@632.8nm

Chamfer:

< 0.2mm x 45°

Pattern:

lines to be etched and filled with black ink/chrome coating

 

line thickness 0.006 +/- 0.002mm

 

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