How do you set up a finderscope on a telescope?

BBC Sky at Night Magazine's Scope Doctor Steve Richards solves your practical astronomy ailments.

Finderscopes and mounts are basic accessories that will help you - and your telescope - navigate the night sky and locate celestial targets. Credit: BBC Sky at Night Magazine

How do you set up a finderscope on a telescope?

A finderscope is a simple but invaluable accessory that attaches to your telescope.

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The smaller optical tube provides a wide field of view to help you locate celestial objects before observing them through your main telescope, but importantly, it must be aligned accurately to your scope before it can be used.

Start aligning in the daytime by finding a very distant object using your telescope, centring that object in your eyepiece as accurately as you can.

Then, without moving the telescope, observe through the finderscope and centre its crosshair on the same object by adjusting the three alignment bolts that hold the finderscope in its cradle.

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Email Steve your astronomy queries to scopedoctor@skyatnightmagazine.com.