Pentax Jupiter III 8x21
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Jupiter III 8x21 PENTAX

Binoculars Jupiter III 8x21Pentax

The Jupiter III 8x21 binoculars PENTAX. They are ideal to carry in your pocket since they barely weigh 160 grams and their small size making them very suitable in different situations such as sporting events, concerts, or for hiking or travel. Of course, the BaK4 prisms and the multi-coating on the integrated lenses give this mini optics a luminous and exceptionally contrasted view.

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Prismáticos Jupiter III 8x21Pentax

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Jupiter III 8x21 PENTAX binoculars

Small and portable
There is no excuse for not having binoculars. Due to their weight of only 160 grams and their small size, Jupiter III universal binoculars are suitable in different situations. The BaK4 prisms and the multi-coating on the integrated lenses, give this mini optics a luminous and exceptionally contrasted view.

Jupiter III binoculars are perfect allies for sporting events, concerts, or for hiking or travel.

Enlargement
The first number in the product name indicates the extension. For the Jupiter 8x21 model, this is the 8x, and it means that you see a subject with binoculars 8 times larger than with the naked eye. In general: the larger the magnification, the smaller the field of view. To observe for a long period, the recommendation is to use a maximum magnification of 10x in general. Larger magnifications make it difficult to keep binoculars still and avoid image movement while watching.

Lens diameter
It is the diameter of the front lens of binoculars. In our Jupiter III example model, this is the second number of the product name and is expressed in mm. In this case 21mm. The larger the diameter, the more light enters the binoculars, this is especially important if binoculars or telescopes are to be used in low-light situations. However, a larger diameter means increasing the size, weight and cost of production.

Exit pupil
The exit pupil is the small shiny area seen in the eyepiece of binoculars. It should be circular and measured in mm. (Note: If this shape appears hexagonal instead of round, this means that a lower prism was used.) The size of the output pupil is obtained by dividing the diameter of the target by the magnification value. For the Jupiter III model, this results in a 2.62 mm exit pupil. IMPORTANT: For comfortable use, the size of the output pupil and the size of the user's pupil should match as much as possible. The pupil diameter of the human eye changes with age.

FP-000010197
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