Instruments

The "very good" rating for binoculars is achieved if they meet the following criteria:

• Magnification between 7 – 8 times
• Front lens diameter min. 50 mm
• Exit pupil: from min. 5 mm
• The field of view should be at least 120 m
• The porro prism design is preferred, as the image looks more three-dimensional, and the binoculars tend to shake less
• Useful accessories such as a compass, a reticle or a swimming belt have a positive influence on the evaluation.

For a "good", the binoculars must achieve these values:

• Magnification: max. 10 times
• Front lens diameter: min. 40 mm
• Exit pupil: min. 4 mm
• Field of view: min. 110 m

For a "medium" we will accept:

• Magnification: max. 12 times
• Front lens diameter: min. 30 mm
• Exit pupil: min. 4 mm
• Field of view: min. 90 m

We rate binoculars as "not recommended” for sailing if the exit pupil is less than 4 mm. In addition, binoculars for use at sea must in any case be waterproof.