Evaluating Binoculars

  • Stephen Tonkin
Part of the The Patrick Moore Practical Astronomy Series book series (PATRICKMOORE)


A few years ago, a colleague told us of a local petrol station that was offering 10 × 22 compact binoculars for sale at £2.99 each. On the reasoning that “you can’t go wrong at that price,” the colleague acquired a pair for his son, who was very pleased with them. Upon hearing of this, another colleague went to the petrol station and bought a pair for herself. When she got home and tried them out, she found that they gave a double image, obviously a case of poor collimation. She returned them to the petrol station, where the sales assistant took them and, without even checking them, placed them in a box and replaced them with a new pair out of another box. My colleague was satisfied with the replacement pair and pleased with the “service” she received from the petrol station.


Focus Mechanism Spherical Aberration Chromatic Aberration Bright Star Petrol Station 
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Copyright information

© Springer Science+Business Media New York 2014

Authors and Affiliations

  • Stephen Tonkin
    • 1
  1. 1.FordingbridgeUK

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