Sightron infini D50L 50/800mm f/16 Achromatic Refractor Telescope OTA

The Sightron infini D50L 50/800mm is a high-quality 50mm achromatic refractor telescope designed for astronomers seeking sharp, high-contrast views of the Moon and planets. Featuring an 800mm focal length and f/16 focal ratio, this optical tube assembly (OTA) is particularly well suited to lunar and planetary observation, making it an excellent choice for beginners and experienced astronomers alike.

With its long focal length, carefully designed optics and lightweight construction, the infini D50L provides an accessible way to explore the finer details of the Solar System. Whether you're observing the Moon's craters, Jupiter's cloud belts or Saturn's iconic rings, this compact refractor offers a rewarding introduction to high-magnification astronomy.

Long Focal Length for Lunar and Planetary Observation

The infini D50L features an 800mm focal length, making it particularly suitable for observing smaller celestial targets such as the Moon and planets.

Compared with shorter focal length refractors, the D50L provides higher magnification when using the same eyepiece, making it easier to examine lunar surface features and planetary details.

Under suitable observing conditions, the telescope can reveal the Moon's craters and mountain ranges, Jupiter's Galilean moons and Saturn's distinctive ring system.

Its long focal length also makes it a useful instrument for experimenting with basic lunar and planetary photography when paired with suitable imaging equipment.

f/16 Achromatic Optics for High-Contrast Views

Although the infini D50L uses a traditional achromatic objective lens, its f/16 focal ratio helps minimise the visible effects of chromatic aberration.

Chromatic aberration can produce coloured fringes around bright objects, particularly when observing the Moon and planets through shorter focal ratio achromatic refractors.

By employing a longer focal ratio, the D50L reduces these unwanted colour fringes, helping deliver sharper images with improved contrast.

This optical configuration makes the telescope especially appealing to observers who prioritise lunar and planetary performance.

Low-Maintenance Refractor Design

One of the key advantages of a refractor telescope is its straightforward operation and minimal maintenance requirements.

Unlike many reflector telescopes, the infini D50L features a fixed objective lens assembly that does not require routine collimation.

Its enclosed optical tube also helps protect the internal optical components from dust and environmental contamination during normal use.

This makes the D50L an excellent option for beginners who want to spend more time observing and less time adjusting their equipment.

Lightweight and Portable Optical Tube

Despite its relatively long 800mm focal length, the Sightron infini D50L remains lightweight and convenient to transport.

Weighing approximately 1.3kg and measuring around 700mm in length, the optical tube can be transported in a suitable telescope carrying bag and used at home or at darker observing locations.

Its lightweight construction makes it suitable for a variety of compatible altazimuth and equatorial telescope mounts, although a sufficiently stable mount is recommended for comfortable high-magnification viewing.

Versatile Dovetail Mounting Connection

The infini D50L features a dovetail plate connection, allowing it to be installed on compatible telescope mounts.

This makes it a convenient choice for astronomers who already own an altazimuth or equatorial mount and want to add a dedicated lunar and planetary refractor to their equipment collection.

The telescope also includes a 52mm threaded connection at the front of the objective lens, allowing compatible accessories to be attached.

Ideal for Beginners and Planetary Enthusiasts

The Sightron infini D50L is an excellent choice for anyone looking for a simple, reliable telescope designed around lunar and planetary observation.

Its combination of 50mm achromatic optics, an 800mm focal length, f/16 optical design and low-maintenance construction makes it particularly appealing to beginners wanting their first telescope or experienced observers seeking a lightweight secondary instrument.

Whether used for casual backyard stargazing or more focused observation of the Moon and planets, the infini D50L offers a practical and enjoyable astronomy experience.

Key Features

50mm achromatic refractor telescope
800mm focal length for lunar and planetary observation
f/16 focal ratio helps minimise chromatic aberration
Designed for sharp, high-contrast views
Ideal for observing the Moon, Jupiter and Saturn
Suitable for basic lunar and planetary imaging with compatible equipment
Low-maintenance refractor design
No routine optical collimation required
Enclosed optical tube helps protect internal components
Lightweight optical tube weighing approximately 1.3kg
Optical tube length of approximately 700mm
Compatible with suitable altazimuth and equatorial mounts
Dovetail plate mounting connection
52mm front objective thread

Specifications

Please Note: This listing is for the Sightron infini D50L optical tube assembly (OTA). A mount, tripod, eyepieces and imaging accessories are not included unless otherwise specified.