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  • BBC Sky at Night

    DIY ASTRONOMY

    Oct 22, 2020 3 minutes

    Turn an unused camera lens into a guidescope

    Improve the accuracy of your mount by repurposing an old lens from a camera

    A guidescope is an important item that helps with autoguiding in astrophotography; it’s needed to correct the small errors that can occur when you are tracking with a motorised mount that has mechanical gears. An example is the unwanted image trailing that can occur – even though your mount has a good alignment – when you are taking very long exposures of an object on your main camera. The guidescope and guide camera, along with

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