Sport Optics

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  5. Sport Optics Guide -Fieldscopes-
  6. Basic Information about Fieldscopes
  7. Magnification

Basic Information about Fieldscopes Magnification

This is the ratio of the apparent size of an object in comparison with what a viewer sees with the naked eye. For instance, an object 1,000m away viewed through a Fieldscope with 50x eyepiece looks about equal in size to an object 20m away viewed with the naked eye. The magnification can be changed with a mounted eyepiece.

Calculation of magnification:

Magnification= Effective objective diameter ÷ Exit pupil diameter
= Focal length of objective lens ÷ Focal length of eyepiece lens