Payload Capacity: 4kg (8.8 lbs) without counterweights Mount Weight: 790 gm (1.75 lbs) with battery Gear System: Strain Wave Gear (SWG) Tracking Speeds: Solar, Lunar, 1X Celestial, 1/2X Celestial Power: Internal 3000mAh Battery (up to 5 hours) with USB-C charging Description FAQ Specifications In the Box Warranty iOptron HST MiniTracker The iOptron HST MiniTracker redefines portable astrophotography by integrating a high-precision strain wave gear (SWG) system into an ultra-compact body that weighs just 790 gm. This advanced gear system supports an impressive 4kg (8.8 lbs) payload—enough for a full-frame DSLR and telephoto lens—without requiring a counterweight. Powered by an internal 3000mAh rechargeable battery, the MiniTracker delivers up to 5 hours of silent, accurate tracking for capturing sharp, long-exposure images of the night sky. Strain Wave Gear: 4kg Payload in a 790g Body The core of the HST MiniTracker is its strain wave gear drive, a technology typically found in high-end observatory mounts. This system provides exceptional torque and zero backlash, allowing the mount to handle a 4kg camera rig with stability. The payload-to-weight ratio is groundbreaking for a travel tracker, eliminating the need for cumbersome counterweights and making it an ideal choice for hikers, travelers, and anyone seeking a minimalist setup. The mount's rigidity is further enhanced by its full CNC all-metal construction, ensuring the stepper motor's precise movements are transferred directly to your camera for sharp, pinpoint stars, even with longer focal length lenses. 4 Tracking Speeds for Celestial and Landscape Imaging The HST MiniTracker includes four distinct tracking speeds to cover a range of astronomical targets. The standard 1X celestial rate perfectly matches the Earth's rotation for deep-sky imaging of nebulae and galaxies, while dedicated Solar and Lunar rates compensate for the unique apparent motion of the Sun and Moon. For nightscape photographers, the 1/2X celestial speed is a critical feature. It slows the tracking to half the sidereal rate, effectively balancing the motion of the stars against a stationary foreground. This allows you to capture a sharp landscape and detailed sky in a single, long exposure, minimizing both star trailing and foreground blur. 5-Hour Internal Battery with USB-C Charging Designed for true field portability, the HST MiniTracker is equipped with an internal 3000mAh Li-Poly battery that provides up to 5 hours of continuous operation on a full charge. This self-contained power system means fewer cables and external batteries to manage during an imaging session. When the battery runs low, the USB Type-C port allows for convenient charging from any 5V source, including a standard portable power bank. This modern interface ensures you can easily extend your imaging time on multi-night trips without needing specialized power supplies. For additional flexibility, the mount also supports an optional 3xAAA battery holder. Flexible Mounting: Vixen Dovetail with 3/8" & 1/4" Sockets The HST MiniTracker offers versatile connection options for seamless integration into your existing gear. The base of the mount features a Vixen-type dovetail bar, allowing it to attach directly to a wide range of equatorial wedges and astronomical saddles. For use with standard photographic equipment, the dovetail bar is also drilled and tapped with both 3/8”-16 and 1/4”-20 threaded sockets, enabling a direct connection to any camera tripod. A crucial trade-off for its compact size is that a polar scope is not built-in. For precise alignment, you can add an optional iOptron iPolar electronic polar scope or the AccuAlignTM dark-field illuminated polar scope, both of which integrate cleanly with the mount. HST MiniTracker vs. Star Adventurer: The Strain Wave Gear Advantage While the Sky-Watcher Star Adventurer series is a benchmark in portable tracking, the HST MiniTracker's strain wave gear offers a distinct advantage in payload efficiency. The Star Adventurer GTi, for example, weighs 1.3kg to support its 5kg payload capacity. Weight-to-Payload Ratio: The HST MiniTracker supports a 4kg payload with a mount body weighing only 790g. This is a significant weight savings for anyone prioritizing a lightweight kit for travel or hiking. No Counterweights: The high torque of the SWG drive eliminates the need for a counterweight system to handle its 4kg capacity, further reducing the total weight and complexity of your setup. Zero Backlash: Strain wave gears are inherently free of backlash, resulting in smoother, more responsive tracking and slewing compared to the worm gear systems common in other trackers. How does the iOptron HST MiniTracker handle a 4kg payload without a counterweight? The HST MiniTracker uses a strain wave gear (SWG) system. This type of gearing produces very high torque with zero backlash, allowing the mount to drive a heavy, off-center load like a camera and telephoto lens with precision, eliminating the need for a balancing counterweight. Can I use the HST MiniTracker to photograph the Andromeda Galaxy (M31) with a full-frame camera and a 200mm lens? Yes, absolutely. A typical full-frame DSLR and 200mm lens combination is well within the 4kg (8.8 lbs) payload capacity of the HST MiniTracker. For deep-sky targets like M31, you would use the 1X celestial tracking speed to ensure sharp, pinpoint stars during your long exposures. What do I need for accurate polar alignment with the HST MiniTracker? The base HST MiniTracker does not include a built-in polar alignment tool. For precise alignment, you will need to add one of iOptron's optional accessories: Optional iPolar Electronic Polar Scope: For fast, highly accurate digital alignment using a laptop. Optional AccuAlignTM Polar Scope: A traditional, illuminated optical polar scope. Optional EQ Base: An adjustable base like the #3327 or #3328 is required to make the fine altitude and azimuth adjustments needed for polar alignment. What is the 1/2X tracking speed on the HST MiniTracker used for? The 1/2X celestial speed is designed specifically for wide-field nightscape photography where you want both the sky and the landscape in one shot. It tracks the stars at half their normal speed, which is slow enough to keep the foreground from blurring significantly, yet fast enough to prevent major star trailing in wide-angle shots. It's the ideal compromise for capturing a sharp horizon and a detailed Milky Way simultaneously. How would I power the HST MiniTracker for a multi-night astrophotography trip? The internal 3000mAh battery provides up to 5 hours of operation. For a multi-night trip, you can recharge the mount during the day using its USB Type-C port connected to a portable power bank, the same kind you would use for a smartphone. This makes it easy to keep the tracker powered up indefinitely in the field. How do I mount the HST MiniTracker to my photo tripod? The base of the HST MiniTracker has a Vixen-style dovetail bar that includes both a 3/8”-16 socket and a 1/4”-20 converter. This allows it to mount directly to the screw on virtually any standard photographic tripod or tripod head without needing any extra adapters. Mount Type Ultra Compact SWG Single-axis Tracking mount Gear System Strain wave gear (SWG) Payload (Max) 4kg (8.8 lbs), no counterweight required Mount Weight 790 gm with battery (1.75 lbs) Drive Motor Stepper motor Tracking Speeds Solar, Lunar, 1X Celestial, 1/2 Celestial (N/S) Quick Slew Yes, for camera framing adjustment Power Source Internal Li-Poly battery or external 5V DC Battery 3000mAh rechargeable Li-Poly (internal) Battery Life Up to 5 hours at 20°C Charging Port USB Type-C (5V) Body Material CNC All-metal Dimensions 133 x 93.25 x 71.5 mm Camera Mounting Ø50 mm block with 3/8”-16 post Base Connection Vixen type dovetail bar w/ 3/8”-16 & 1/4”-20 sockets Polar Scope Optional iPolar or AccuAlignTM Polar Scope Recommended EQ Base Optional #3327 or #3328 Operating Temperature -10°C to 40°C HST MiniTracker Mount × 1 Li-Poly Rechargeable Battery Installed 3/8” to 1/4” Threaded Converter Installed Type-C USB Charging Cable × 1 iOptron Limited Warranty
