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Smart scope's spinning sensor fights Earth's spin to erase star trails

Draco, DwarfLab's new smart telescope, eliminates star trails in deep-sky astrophotography. Its spinning sensor cancels Earth's rotation, ditching equatorial mounts, guide scopes, and polar alignment.

Elena Voss
Elena Voss
·3 min read·23 views

Originally reported by New Atlas · Rewritten for clarity and brevity by Brightcast

Draco, a new smart telescope from DwarfLab, tackles a common problem in deep-sky astrophotography. It uses a sensor that spins to counteract star trails caused by Earth's rotation. This means users don't need complex equipment like an equatorial mount or guide scope.

The telescope features a larger 90-mm lens. DwarfLab believes that more light-gathering power is better than making the device smaller.

A New Way to Fight Star Trails

Smart telescopes often focus on being easy to use. You just point them and let an app do the work. However, this often means they sacrifice the power needed for serious deep-sky photos. A bigger lens usually requires a larger, more expensive mount to keep it stable.

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Draco aims to offer both ease of use and strong optical power. It's designed for beginners who might not know what an equatorial mount is.

The telescope solves "field rotation," which is the slow twisting of the sky's image that causes star trails. Instead of moving the whole telescope, Draco's CMOS sensor rotates itself. This rotation cancels out the sky's movement right where the image is formed.

This system also includes continuous star drift correction. These features allow Draco to take single exposures up to 300 seconds. It can do this even in its simplest mode, where it just points up and sideways, without blurring stars into streaks.

This rotating sensor is a clever solution. It fixes a problem that DwarfLab's own compact designs helped create. Lighter mounts are easier to sell but harder to keep steady for long exposures. The rotating sensor solves this trade-off with hardware.

Photographers can still use an optional equatorial tracking mode if they prefer. A Pro Mode offers manual control over exposure and gain, from 1/10,000 of a second up to 300 seconds.

Design and Features

The new Draco telescope weighs about 5.5 kg (12.1 lb). Earlier models like the Dwarf III weighed 1.35 kg (3 lb), and the Dwarf Mini, set for release in late 2025, was even lighter at 840 g (1.85 lb).

Draco keeps the simple, one-tap operation of its predecessors. However, it uses a much larger optical system. It has a 90-mm lens with a 340-mm focal length and an f/3.8 focal ratio. The body is 386 mm (15.2 in) long, small enough for a suitcase. The design prioritizes more glass for better images.

The f/3.8 speed means it gathers about 2.2 times more light than a typical f/5.6 setup. This allows for shorter exposure times to capture clear images of faint galaxies or nebulae. It also means less time spent waiting for enough light to hit the sensor.

Tripod-ready in minutes, no polar alignment or guide scope required

The telescope's 77-Wh battery can last up to five hours. This depends on the imaging mode and conditions. It has an IP56 rating for dust and water resistance. It can operate in temperatures from –20 °C to 45 °C (–4 °F to 113 °F).

Draco's main camera uses a 50-megapixel, 1/1.3-inch sensor. For deep-sky objects, it combines four pixels into one (2x2 binning). This boosts light sensitivity, reducing the resolution to about 12 MP. For the Sun, Moon, and planets, it uses its full native resolution to capture fine details like lunar craters.

Pre-Order Options

DwarfLab is offering two versions for pre-order. The Standard Edition costs US$1,299. It includes a dual-narrowband H-alpha plus OIII filter and a built-in solar ND filter. This covers nebulae and casual solar imaging.

The SHO Edition costs $1,499. It replaces the internal solar filter with a built-in S II plus OIII filter, adding sulfur. This allows it to automatically capture and combine all three gases for the blue-and-gold "Hubble Palette" look. It still comes with an ND filter for solar imaging, but it's an external accessory that must be attached manually.

Deep Dive & References: DwarfLab

Brightcast Impact Score (BIS)

This article describes a novel technological solution to a long-standing problem in astrophotography, making deep-sky imaging more accessible. The innovation of a spinning sensor to counteract Earth's rotation is a significant step forward, offering a more convenient and potentially higher-quality experience for amateur astronomers. The evidence is based on the technical description of the product and its intended functionality.

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Sources: New Atlas

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