Pentax

Pentax 8x21 Jupiter III Compact Binoculars

Name: Pentax 8x21 Jupiter III Compact Binoculars
Brand: Pentax
SKU: 8x21 Jupiter III Binoculars

See the World Up Close with Compact Clarity The Pentax 8x21 Jupiter III Binoculars are lightweight and portable, offering exceptional clarity for sporting events, concerts, hiking, and travel. Their high-quality BaK4 prisms and multi-coated lenses deliver bright, high-contrast images. Brand...

Check availability

Affiliate Disclosure: As an Amazon Associate, Studio Supplies earns from qualifying purchases made through links on this page, at no additional cost to you. This helps support our editorial team.

Notice a mistake? Let Us Know

Overview

See the World Up Close with Compact Clarity

The Pentax 8x21 Jupiter III Binoculars are lightweight and portable, offering exceptional clarity for sporting events, concerts, hiking, and travel. Their high-quality BaK4 prisms and multi-coated lenses deliver bright, high-contrast images.

Brand: Pentax
Model: 8x21 Jupiter III
Magnification: 8x
Objective Lens Diameter: 21mm
Prism Type: BaK4
Color: Black

Key Features

9 x Magnification

Effective diameter of objective lens 21 mm

Exit pupil aperture: 2.63 mm

Eye relief: 10 mm

Focusing range: About 15 ft. to infinity

Specifications

Magnification

Objective Lens Diameter

21 mm

Exit Pupil Aperture

2.63 mm

Eye Relief

10 mm

Focusing Range

Approx. 15 ft. to infinity

Frequently Asked Questions

What is the magnification power of the Pentax 8x21 Jupiter III binoculars?

These Pentax binoculars offer an 8x magnification, allowing you to bring distant objects significantly closer for detailed viewing.

What is the effective diameter of the objective lens?

The effective diameter of the objective lens on these binoculars is 21 mm, contributing to their compact size.

What is the eye relief provided by the Jupiter III binoculars?

The eye relief for the Pentax Jupiter III is 10 mm, which is the distance your eye can be from the eyepiece and still see the full field of view.

What is the focusing range of these binoculars?

The focusing range of the Pentax 8x21 Jupiter III binoculars is approximately 15 feet to infinity, accommodating various viewing distances.

What is the exit pupil aperture of these binoculars?

The exit pupil aperture is 2.63 mm, indicating the diameter of the light beam exiting the eyepiece that enters your eye.

Strengths & Trade-offs

👍 Pros

Provides 8x magnification, allowing for clear observation of distant subjects with good detail.
The compact size and lightweight design make these binoculars highly portable and easy to carry.
Features a 21 mm objective lens, offering a balance between light gathering and a sleek form factor.
Offers a focusing range from approximately 15 feet to infinity, suitable for a wide variety of viewing scenarios.
With an exit pupil aperture of 2.63 mm, it provides adequate light to the eye for general daylight use.

👎 Cons

The 21mm objective lens might limit brightness and performance in very low light conditions compared to larger binoculars.
An eye relief of 10 mm is on the shorter side, which could be less comfortable for eyeglass wearers during extended viewing.
The compact form factor may not provide the most stable grip for users with larger hands.
The 8x magnification is fixed, meaning there is no zoom capability for varying viewing needs.
A minimum focusing range of 15 feet might not be ideal for observing very close subjects like insects or nearby plants.