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SVBONY SV197 Collimation Eyepiece 1.25" Cheshire Collimating Eyepiece for Newtonian Reflector Telescope Main Features: Make your seeing experience much better with this simple tool! Quickly and precisely align your Newtonian reflector telescope! Stars don't come to a pinpoint focus, Planets look slightly hazy, Sometimes optics yield images that are less than perfect. To prevent this from happening, you'd better collimate your Newtonian telescope with a collimator. The 1.25" collimator is an excellent accessory. It can take some time to get 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. Collimating a telescope consists of adjusting the tilt and position of the mirrors and lenses to ensure that the focal point reaches optimum focus at the point from which the image will be viewed (the eyepiece or possibly a camera). ●Great for quick and precise alignment of your Newtonian reflector telescope, to get the most out of the Newtonian scope you really need to align or collimate the mirrors. ●It can take some time to get 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 ●Collimating a telescope consists of adjusting the tilt and position of the mirrors and lenses to ensure that the focal point reaches optimum focus at the point from which the image will be viewed (the eyepiece or possibly a camera) ●Black metal construction How to use it? Step1. Put the Collimation Eyepiece (Short Version) into the Tube Step 2. Make sure the blackspot is in the center of 2 lines of collimation eyepiece.congraluationsonyou.You have Collimated Your Telescope. Step 3. If it is not in the center，please adjust the screws,in this way.you wilL collimate sucessfully