2x 1.25Inch Cheshire Collimating Eyepiece for Newtonian Refractor Telescopes Structure Astronomical Telescope Accessory

2x 1.25Inch Cheshire Collimating Eyepiece for Newtonian Refractor Telescopes Structure Astronomical Telescope Accessory Beschrijving

set2: 1 x Short calibration eyepiece + 1 x Long Calibration Eyepiece
Economical collimation tool ensures that your reflector telescope's optics are in precise alignment.
Combination 5inch long sight tube and 1.25inch Cheshire eyepiece.
For aligning optics of Newtonian reflectors, Peephole in top and crosshairs at bottom enable precise optical centering.

Compatible with 1.25inch telescope focusers or 2inch focusers with a step-down adapter for using 1.25inch accessories
To get the most out of your Newtonian scope you really need to align or collimate the mirrors.
It can take some getting used to aligning both the secondary and primary mirrors and this short collimator can make it much easier. The short collimator for mirror (reflector) telescopes has a 45 degree plate for easier visual accuracy.
Collimation is the alignment of elements inside an optical system like a telescope. Colimating a telescope consists of adjusting the tilt and position of the mirrors and lenses to ensure that the point reaches optimum focus at the point from
Size: 4.2 x 4.2 x 15.2cm
which the image will be viewed (the eyepiece or possibly a camera).
colour:black
Material:Aluminum alloy

Package Contents:
1 x Short calibration eyepiece
1 x Long Calibration Eyepiece
2 x boxes
2 x opp bag