iOptron HAE18C Dual Equatorial / Alt-Azimuth Strain Wave Mount Head

The iOptron HAE18C is what happens when you design an equatorial mount around portability from the beginning rather than trying to make a traditional mount smaller.

The complete mount head weighs just 6.2 lb (2.82 kg), including its Vixen-style saddle, yet iOptron rates it to carry 18.7 lb (8.5 kg) without a counterweight. Add the optional counterweight system and capacity rises to 26.5 lb (12 kg). That's roughly three times the mount's own weight before you ever install a counterweight — an impressive amount of capability for something small enough to travel in its included hard case.

The HAE18C uses strain-wave gearing on both axes, operates in either equatorial or alt-azimuth mode, and includes the electronics needed for computer, tablet, or smartphone control without requiring a hand controller. Built-in Wi-Fi, USB-C connections, onboard cable-management connections, and iOptron's electronic friction brake round out a mount aimed squarely at observers and imagers who would rather carry more telescope than mount.

The important word with the HAE18C is compact. Payload capacity is only part of the story with any small mount. A short refractor or compact imaging system is much easier for the mount to manage than a long tube with the same weight positioned farther from the RA axis. Keep the system appropriately sized and the HAE18C offers an unusual amount of mount in a very small package.

Features

• Only 6.2 lb (2.82 kg) for the mount head. Small enough for a travel kit, airline-friendly astronomy setup, or a grab-and-go system that doesn't require a second trip to the car just for the mount.
• 18.7 lb counterweight-free payload. iOptron rates the HAE18C for 8.5 kg (18.7 lb) without a counterweight, giving compact refractors and imaging systems plenty of room without carrying a traditional counterweight shaft and weights.
• Up to 26.5 lb with a counterweight. Add the optional shaft and 10 lb counterweight when additional capacity is needed, increasing the rated payload to 12 kg (26.5 lb).
• Dual strain-wave drives. Both RA and DEC use strain-wave gearing with a 360:1 reduction ratio, providing high torque in a very compact mechanical package.
• Equatorial and Alt-Az operation. Use EQ mode for astronomical tracking and imaging, or configure the mount in Alt-Az mode for straightforward visual observing.
• Built-in Wi-Fi and USB control. The HAE18C's internal control board allows operation from a computer, smartphone, tablet, Raspberry Pi, or compatible third-party astronomy software without requiring a hand controller.
• Optional Go2Nova hand controller. Observers who prefer a physical handset can add iOptron's 8411 Go2Nova controller, while those who work from a phone or computer don't have to buy one.
• USB-C and 12V connections at the mount. Connections on the mount and saddle help keep control and power wiring close to the telescope instead of hanging loosely around the moving axes.
• Electronic friction brake. Designed to stop the mount safely during a planned or unexpected power interruption rather than allowing the loaded system to move freely.
• Built-in zero-position search and locator. Helps the mount establish its reference position without relying entirely on the user to return the axes manually.
• Optional iPolar electronic polar scope. Add iOptron's electronic polar-alignment system when you want a dedicated polar-alignment solution integrated into the setup.
• 3/8"-16 tripod connection. The mount can attach to compatible astronomy tripods as well as suitably rated photographic supports using the common 3/8"-16 standard.
• Hard carrying case included. A fitted case protects the mount during the kind of travel it was designed for.

Why Strain-Wave Gearing Changes the Package

A conventional German equatorial mount normally relies on large worm wheels, substantial housings, and counterweights to balance the telescope around the axes. That works extremely well, but the supporting hardware can quickly weigh more than the telescope itself.

Strain-wave gearing takes a different approach. Its high reduction ratio and torque allow the mount to carry an off-balance payload without requiring the same counterweight system for ordinary use. On the HAE18C, both axes use 360:1 strain-wave reductions, allowing iOptron to build the entire head at just over six pounds.

That doesn't make weight distribution irrelevant. The farther a telescope's center of gravity sits from the mount's RA axis, the greater the leverage the drive has to manage. That's why iOptron's payload specification is based on a center of gravity approximately 200mm from the RA axis.

For a short refractor, compact astrograph, camera-and-lens system, or similarly concentrated payload, the HAE18C's capacity is remarkably useful. A long refractor or heavily rear-loaded optical tube deserves more margin even when its actual weight remains under the published limit.

Equatorial When You Image, Alt-Az When You Observe

The HAE18C doesn't have to spend its life as an imaging mount.

In equatorial mode, polar alignment allows the mount to follow the sky on a single rotational axis, making it the natural configuration for astrophotography. Pulse guiding through ASCOM is supported when longer exposures require continuous tracking correction.

Switch to Alt-Az mode and the same mount becomes a compact GoTo platform for visual observing. There's no need to polar align for an ordinary visual session, and a small refractor on a six-pound mount head makes a genuinely attractive grab-and-go combination.

The latitude mechanism has two ranges — 0° to 47° and 43° to 90° — allowing the mount to operate across essentially any observing latitude and providing the geometry needed for Alt-Az configuration as well.

Control Without a Required Handset

The “C” in HAE18C is significant. The mount contains its own main control board, so unlike earlier configurations it doesn't require a hand controller to provide the brains of the system.

Built-in Wi-Fi allows the HAE18C to work with iOptron Commander Lite on a smartphone or tablet and with compatible applications such as SkySafari Pro. Windows users can control the mount through iOptron Commander and ASCOM, while INDI support opens the door to Mac, Linux, and Raspberry Pi-based systems.

USB-C ports on the mount base and saddle provide direct computer control and firmware access. The saddle also carries power connectivity, helping reduce the number of long cables that have to follow the telescope as it moves.

If you prefer physical buttons in the dark, iOptron's 8411 Go2Nova OLED hand controller remains available as an option. You simply aren't required to buy it if your observing and imaging workflow already revolves around a computer or mobile device.

Payload: The Number and the Geometry

The headline capacity is 18.7 lb without counterweights and 26.5 lb with the optional counterweight system. Those are impressive numbers for a 6.2 lb mount, but they need to be understood correctly.

iOptron's rating assumes the payload's center of gravity is approximately 200mm from the RA rotation axis, roughly corresponding to a compact optical tube around 220mm in size. As the telescope becomes longer, the moment arm increases even if the scale doesn't.

That is why the HAE18C is particularly appealing with compact refractors, short astrographs, camera lenses, and smaller catadioptric telescopes. A long 18-pound refractor does not present the same load to the mount as a compact 18-pound imaging system.

The optional counterweight gives you additional capacity when you need it, but one of the attractions of this mount is that many appropriately sized systems won't need one at all.

What's Included

• iOptron HAE18C strain-wave AZ/EQ mount head
• Vixen-style dovetail saddle
• Fitted hard carrying case
• 12V AC/DC power adapter for indoor use

Available separately: Go2Nova 8411 OLED hand controller, iPolar electronic polar scope, carbon-fiber tripod, counterweight shaft and counterweight, MiniPier extensions, and other compatible mounting accessories.

Frequently Asked Questions

How much can the HAE18C carry without a counterweight?
iOptron rates it for up to 18.7 lb (8.5 kg) without a counterweight. That rating assumes the payload's center of gravity is approximately 200mm from the RA axis, so compact payloads are better suited to reaching the published capacity than long optical tubes.

How much can it carry with a counterweight?
With the optional counterweight shaft and counterweight installed, iOptron rates the mount for up to 26.5 lb (12 kg), subject to the same payload-geometry consideration.

Do I need a counterweight?
Not for an appropriately sized system within the 18.7 lb counterweight-free rating. The optional counterweight system is available when you need additional payload capacity or when the geometry of a particular setup makes it useful.

Can I use the HAE18C for astrophotography?
Yes. The mount operates in equatorial mode, supports automatic tracking and ASCOM pulse guiding, and is particularly attractive for portable imaging systems. Telescope length, focal length, wind exposure, and payload geometry should all be considered in addition to the published weight rating.

What is the mount's periodic error?
iOptron specifies periodic error at less than 36 arcseconds peak-to-peak, or less than ±18 arcseconds, with a 360-second period. For demanding long-exposure imaging, plan on guiding rather than treating the mount as an unguided imaging platform.

Does it have a built-in polar scope?
No. iOptron's iPolar electronic polar scope is available as an optional accessory for the HAE18C.

Does it include a hand controller?
No. The HAE18C has its own internal control board, built-in Wi-Fi, and USB connectivity, so a handset isn't required. The Go2Nova 8411 OLED hand controller is available separately for users who want one.

Can I use the HAE18C for visual observing?
Yes. The mount can operate in Alt-Az mode for visual use, which eliminates the need for polar alignment during a normal observing session.

What tripods can I use?
The HAE18C uses a standard 3/8"-16 mounting connection. iOptron's carbon-fiber tripod is an obvious match, but other suitably rigid supports with a compatible 3/8"-16 mounting post can also be used.

What power does the mount require?
The HAE18C operates from 12V DC at up to 5A using a 5.5/2.1mm connector. iOptron lists typical consumption at about 0.6A while tracking and approximately 1A during GoTo slews.

How cold can it operate?
iOptron specifies an operating range of -4°F to 113°F (-20°C to 45°C).

Final Thoughts

The HAE18C makes the most sense when portability is part of the observing plan rather than an afterthought.

A 6.2 lb mount head capable of carrying 18.7 lb without counterweights changes what a travel or grab-and-go system can look like. Add dual EQ/Alt-Az operation, built-in Wi-Fi, computer control, onboard USB and power connectivity, and the option to increase payload with a counterweight later, and the little iOptron can cover a surprising amount of ground.

The important thing is to pair it with the right telescope. The HAE18C rewards compact optical systems far more than long tubes that happen to weigh the same amount. Choose the payload with geometry as well as weight in mind, and you get exactly what this mount was built to provide: serious GoTo capability without carrying a serious amount of mount.

Tech Details:

*iOptron's payload ratings assume the payload center of gravity is approximately 200mm from the RA rotation axis, or a similarly compact optical-tube configuration.