Sightron infini D50 50/540 Achromatic Refractor Telescope OTA

The Sightron infini D50 50/540 is a compact, high-quality 50mm achromatic refractor telescope designed for astronomers seeking sharp optics, excellent contrast and convenient portability. Featuring a 540mm focal length and f/10.8 focal ratio, this optical tube assembly (OTA) is an excellent choice for beginners, experienced observers and anyone looking for a lightweight telescope for casual stargazing.

Developed by Sightron Japan with careful attention to optical performance, the infini D50 delivers crisp views of the Moon, planets and brighter deep-sky objects. Its straightforward refractor design makes it an appealing first telescope or a portable secondary instrument for observing sessions away from home.

High-Quality 50mm Achromatic Optics

The infini D50 features a 50mm achromatic objective lens paired with a relatively long f/10.8 focal ratio.

This optical configuration helps minimise chromatic aberration and other optical imperfections commonly associated with achromatic refractors, producing sharp images with good contrast.

The telescope is particularly well suited to lunar observation, allowing you to explore craters, mountain ranges and other features across the Moon's surface.

Under suitable observing conditions, it can also reveal Jupiter's brightest moons, Saturn's rings and a variety of other interesting celestial targets.

540mm Focal Length for Versatile Astronomy

With its 540mm focal length, the Sightron infini D50 offers a versatile observing experience for a compact refractor.

When paired with a suitable low-magnification eyepiece, the telescope can provide wider views of bright star clusters, prominent nebulae and other extended celestial objects.

Switching to a shorter focal length eyepiece increases magnification, making it easier to examine lunar features and planetary targets in greater detail.

The combination of a 50mm aperture and 540mm focal length makes the infini D50 particularly appealing to observers interested in both general stargazing and lunar astronomy.

Carefully Designed f/10.8 Optical System

While the infini D50 uses a traditional achromatic objective, its optical system has been developed to maximise image quality.

The f/10.8 focal ratio helps control chromatic aberration and maintain sharpness, making it well suited to visual astronomy.

This thoughtful optical design allows the telescope to deliver pleasing views without requiring the complexity or expense of more advanced optical systems.

Lightweight and Portable Optical Tube

Weighing approximately 1.3kg and measuring around 500mm in length, the Sightron infini D50 is easy to transport, store and set up.

Its lightweight construction makes it suitable for use with a wide range of compatible altazimuth and equatorial telescope mounts, while the compact optical tube can be stored in many telescope carrying bags.

Whether you're observing from your backyard, travelling to a dark sky location or looking for a convenient grab-and-go telescope, the infini D50 offers a practical solution.

Flexible Mounting Options

The infini D50 features a dovetail plate connection, allowing the optical tube to be attached to compatible telescope mounts.

This makes it a convenient option for astronomers who already own a suitable altazimuth or equatorial mount and want to add a compact refractor to their equipment collection.

The telescope also features a 52mm threaded connection at the front of the objective lens, providing additional flexibility for compatible accessories.

Ideal for Beginners and Experienced Astronomers

The Sightron infini D50 50/540 is a versatile telescope for anyone who values optical quality, portability and ease of use.

Its compact size makes it an excellent choice for beginners assembling their first telescope setup, while its lightweight design is equally appealing to experienced observers looking for a convenient secondary refractor.

Key Features

50mm achromatic refractor telescope
540mm focal length
f/10.8 focal ratio
Designed for sharp, high-contrast astronomical views
Ideal for lunar, planetary and brighter deep-sky observation
Compact optical tube measuring approximately 500mm
Lightweight design weighing approximately 1.3kg
Compatible with suitable altazimuth and equatorial mounts
Dovetail plate mounting connection
52mm front objective thread
Suitable for beginners and experienced astronomers
Convenient optical tube assembly for portable astronomy

Specifications

Please Note: This listing is for the Sightron infini D50 optical tube assembly (OTA). A mount, tripod and eyepieces are not included unless otherwise specified.