Sport Optics

How to Choose Fieldscopes

How to choose eyepieces

Magnification is determined by the combination of Fieldscope body and eyepiece.
Eyepieces are available in various types including a wide type that has a fixed magnification, and a zoom type with non-step adjustable magnification.

Magnification of Fieldscopes

The magnification of a Fieldscope is determined by the combination of the body's effective diameter of the objective lens and the eyepiece. Eyepieces are available in various types including a wide type or a zoom type, and eyepieces for digiscoping have also been developed. Choose the appropriate magnification according to your needs.

Combination examples of eyepiece and magnification
Wide type: fixed magnification (low magnification) Wide type: fixed magnification (high magnification) Zoom type
Characteristics
Recommended for observing near and wide-moving subjects.
Recommended for observing distant subjects, details and for fixed-point observation.
Non-step adjustable magnification from low to high.
Effective diameter of the objective lens/Magnification 85mm/20x
65mm/16x
85mm/75x
65mm/60x
85mm/20-60x
65mm/16-48x
Field of view*
20x
75x
20-60x
 
  • *When using 85mm effective diameter of the objective lens
  • *Photos are simulated viewfinder images.
  • *When using 85mm effective diameter of the objective lens
  • *Photos are simulated viewfinder images.
  • *When using 85mm effective diameter of the objective lens
  • *Photos are simulated viewfinder images.
  • *When using 85mm effective diameter of the objective lens
  • *Photos are simulated viewfinder images.

Comparing zoom type eyepiece and fixed magnification eyepiece

A Nikon's zoom type eyepiece allows you to adjust the magnification at any position from low to high and lets you enjoy various magnifications. Compared with a fixed-magnification eyepiece, the field of view of a zoom type eyepiece is narrower, however, if you plan to use a Fieldscope in a variety of situations, it is recommended for your first eyepiece. A fixed-magnification eyepiece is designed to secure a wider field of view. You can choose the most appropriate magnification eyepiece according to your particular needs, and you will obtain high-quality images whichever strength you select, because the optical structure is optimized for each magnification.
If your observation conditions are fixed and require a wider field of view, or for digiscoping where vignetting must be minimized, fixed-magnification eyepieces are recommended.

The field of view comparison between a zoom type eyepiece and a fixed-magnification type eyepiece.

A zoom type eyepiece can be set at several magnification positions within the zoom range.
Compared with a fixed-magnification type at the same magnification, the field of view of the fixed-magnification type eyepiece will be wider.

Field of view: fixed-magnification type at 20x
(Field of view at 1,000m is 58m)
Field of view: zoom type at 20x
(Field of view at 1,000m is 38m)
  • *When using 85mm effective diameter of the objective lens
  • *Photos are simulated viewfinder images.

Sport Optics Guide -Fieldscopes-


Basic Information about Fieldscopes


How to Choose Fieldscopes


How to Use Fieldscopes


Sport Optics Guide -Binoculars-