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Some eyepieces are designed with reticles on the lens or overlaid in the optical train of the eyepiece. These eyepieces are excellent for pursuits like polar alignment or guiding of any kind. They are also great for use with a finderscope to help you perfectly hone in on your desired target, providing a similar benefit to a crosshair. In general, these eyepieces will be most well suited to cases where accuracy is of the utmost importance.