A camera, a lens and one motor against the rotation · review
OGST Single-axis tracker (QIO112) review
OGST's single-axis tracker: a 1.4 kg mount carrying 4 kg, with a stepper motor and 1:101.25 gear train for ±10 arcseconds of periodic error over 10 minutes, open-source Wi-Fi control and polar scope, phone and star-pointer alignment.
OGST publishes the figure that decides a tracker’s worth: ±10 arcseconds of periodic error over 10 minutes, from a stepper motor and a 1:101.25 gear train. It also says what that buys: pinpoint stars in 120-second exposures at 300 mm.
Light, with a real payload
The body weighs 1.4 kg (3.1 lb) and carries 4 kg (8.8 lb). Travel Mode is for grab-and-go wide fields; Fixed Mode for stability during long sessions.
Three ways to align
An optical polar scope, a smartphone method and a star pointer. Beginners can start with the phone; experienced imagers will use the polar scope.
Open-source control
Wi-Fi with browser or app control, on an open-source system that users can update and customize.
Two materials
The bullets describe an ABS and carbon-composite body; the specification table says PETG.
Price and availability
On November 7, 2026, Amazon.com listed it at about $326 from a third-party seller.
Figures as Keepa reported them on the day this page was last updated. Stock and pricing shift without warning.
Prices quoted in this text were read on November 7, 2026. The live price is at the top of the page.
Its two nearest scopes on price
Same aisle, closest price — what the same spend else shows.
Periodic error published: ±10 arcsec over 10 minutes
4 kg on a 1.4 kg body
Three polar-alignment methods and open-source Wi-Fi control
Compromises
Body material given two ways (ABS/carbon and PETG)
Power source and counterweight not published
About $326
Specifications
Payload
4 kg (8.8 lb), stated
Counterweight
Not published by the maker.
Tracking rates
Not listed as rates · ±10 arcsec periodic error over 10 minutes · supports 120 s exposures at 300 mm, stated · solar observation with proper filters mentioned
Polar alignment method
Optical polar scope, smartphone alignment or star-pointer alignment
Power source
Not published by the maker.
Weight
1.4 kg (3.1 lb), stated · 15 × 12 × 18 cm
Head fitting
Not published · Travel Mode and Fixed Mode · body stated as ABS plus carbon composite in the bullets, PETG in the specifications
Amazon reference
B0G43NNNCX
EAN
6213960096042
What observers ask about this one
What does ±10 arcsec of periodic error mean?
Over a 10-minute cycle, the mount runs up to 10 arcseconds ahead of or behind the sky. OGST says that keeps stars sharp for 120-second exposures at 300 mm, a useful figure that few trackers publish.
How is it aligned?
Three ways: an optical polar scope, a smartphone-based method, or a star pointer (never aimed at people).
What is open-source control?
The Wi-Fi control system runs in a browser or app and is open source, so users can update or customize it.
The price on Amazon.com
This model is listed on Amazon.com, at ≈ $326 at the last reading. Listed is not the same as in stock: availability changes daily, and the buy box shows the live price.
Details checked on November 7, 2026.
This one and its buyer, among astronomy instruments
A camera and a 300 mm lens under a dark sky, for someone who wants the tracking error on paper
Eyepieces and parts stated to fit
Listed because the eyepiece or part names this scope.
Specifications: the manufacturer sheet for telescopes and observing optics and the matching Amazon product page. Prices and availability: Keepa. Every figure on this page names its source.
4 kg (8.8 lb) axial, 2 kg (4.4 lb) lateral without counterweights · 500 g (17.6 oz) · ESP32 on 5 V · star pointer to −10 °C (14 °F)
OrionU's dual-screw steel-shaft star tracker: a 500 g carbon-fiber PETG body carrying 4 kg axially and 2 kg laterally without counterweights, with a high-brightness polar pointer, ESP32 control on 5 V power and a 3/8-inch tripod fitting.
Best for: A camera and short lens carried a long way, where every gram and every counterweight counts
Motorized tracker · Wi-Fi with the SAM Console app · deluxe equatorial base · fits photo tripods · wide-field, time-lapse and telescopic use
Sky-Watcher's Star Adventurer 2i Pro Pack: a motorized portable tracking platform with Wi-Fi control from the free SAM Console app and a deluxe equatorial base, for Milky Way, eclipse, time-lapse and small-telescope use on a photo tripod.
Best for: Camera-based night sky photography on an existing photo tripod
Sidereal, lunar, solar and time-lapse speeds · 20 hours on 4 AA · 22.4 oz in the bullets, 23 oz in the title · LCD menu
SLIK's ECH-630: a compact motorized star tracker with sidereal, lunar, solar and time-lapse speeds, an LCD menu and up to 20 hours on four AA batteries, about the size of a 24-70 mm lens, with an optional SMH-250 polar head.
Best for: Backcountry night photography where batteries must be replaceable and the speed switchable
