As an imaging system grows, the mount usually reaches its limit before the telescope does. A larger optical tube may be only the beginning; add rings, dovetails, a camera, filter wheel, electronic focuser, off-axis guider, reducer or corrector, dew equipment, and perhaps a second telescope, and a system that started comfortably on a mid-size mount can become a very different load.
The iOptron CEM70AW is built for that next step. It carries up to 70 lb (31.8 kg) of telescope and imaging equipment, excluding counterweights, on a mount head that weighs 30 lb (13.6 kg). That gives it considerably more capacity than a typical mid-size imaging mount without moving all the way to the size and weight of the CEM120 observatory platform.
The AW version adds two features that matter once an imaging setup becomes more complex: built-in Wi-Fi and USB 3.0 through the mount. A single USB 3.0 connection at the RA axis feeds the mount, internal iPolar, and three-port USB 3.0 hub at the saddle, while built-in Wi-Fi gives you another way to communicate with the mount without running a separate control cable.
Underneath those connections is the same serious CEM70 imaging platform: internal iPolar, Permanent Periodic Error Correction, automatic zero-position sensing, built-in GPS, an 8-inch spring-loaded dual saddle, through-mount power distribution, and a hard carrying case. If you want the capacity of the CEM70 but also want a cleaner high-speed data path through the mount, this is the version that makes the most sense.
Key Features
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70 lb payload capacity. iOptron rates the CEM70AW for up to 31.8 kg (70 lb) of telescope and imaging equipment, excluding counterweights.
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30 lb mount head. A relatively manageable head for a mount in this payload class.
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Center-Balanced Equatorial design. iOptron's CEM layout places more of the combined mount and payload mass directly over the tripod or pier.
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Built-in Wi-Fi. Provides wireless mount communication for remote operation without requiring a separate Wi-Fi adapter.
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USB 3.0 through the mount. One USB 3.0 input feeds the mount, internal iPolar, and three-port USB 3.0 hub near the saddle.
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Internal iPolar electronic polar scope. The polar-alignment camera is built into the RA axis and uses plate solving rather than requiring you to position Polaris on a traditional reticle.
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Periodic error below ±5 arcseconds. iOptron specifies native PE below ±5 arcseconds, measured on the bench over the 348-second RA worm period.
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Permanent Periodic Error Correction. A trained PEC curve can be stored in the mount and replayed to reduce the repeatable component of RA tracking error.
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151mm worm wheels on both axes. RA and DEC each use a 248-tooth worm wheel driven by a 21.2mm worm.
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55mm steel axles and 80mm bearings. Substantial mechanical components support the CEM70's larger payload class.
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Precision stepper motors. 128 micro-steps provide a specified motor resolution of 0.07 arcsecond.
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Up to 3.75°/sec slewing. Maximum GoTo speed is approximately 900× sidereal.
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Go2Nova 8410 hand controller. Provides an 8-line × 21-character display and iOptron's extensive GoTo database.
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Built-in 32-channel GPS. Supplies UTC time and location information to the mount.
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Automatic zero-position search. The mount can electronically locate its mechanical reference position.
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Configurable meridian treatment. The mount can stop or automatically flip, with settings allowing up to 10° of travel past the meridian when clearance permits.
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8-inch spring-loaded dual saddle. Accepts both Losmandy D and Vixen-style dovetail plates.
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Through-mount power distribution. DC power connections near the saddle help keep accessory wiring off the moving axes.
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Hard carrying case included. Protects the 30 lb mount head during storage and transport.
- Two-year limited warranty.
Why Choose the CEM70AW?
The mechanical capacity is the same reason you would choose any CEM70: room for a larger and more complete imaging system without moving into the CEM120 weight class.
The AW version is about connectivity.
Modern imaging systems can have a main camera, guide camera, filter wheel, electronic focuser, rotator, and other USB devices clustered around the telescope. Without through-mount cabling, all of those connections eventually have to cross a moving axis or feed into a hub attached somewhere on the optical tube.
The CEM70AW moves much of that connection point into the mount itself. A USB 3.0 input at the RA axis feeds the mount's internal electronics and three USB 3.0 ports near the saddle. Instead of running several long data cables down from the telescope, compatible accessories can connect close to where they are mounted.
Built-in Wi-Fi adds another control option. It is useful when you want wireless communication with the mount from a nearby computer without adding a separate wireless adapter. As with any Wi-Fi connection, actual range depends on the building, walls, interference, and network environment, so a permanent remote observatory may still benefit from its own dedicated network arrangement.
Room for the Complete Imaging System
The real advantage of a 70 lb mount is not necessarily putting a 70 lb optical tube on it. It is having room for everything that turns a telescope into an imaging system.
A C11, large refractor, Ritchey-Chrétien, or similar telescope can pick up a surprising amount of weight once the camera, filter wheel, focuser, rotator, guider, corrector, dew equipment, dovetails, and other hardware are installed. A side-by-side system adds even more.
The CEM70AW gives you space to build that complete system without treating every accessory as the last few pounds the mount can tolerate.
Payload weight is still only part of choosing a mount. A compact telescope and a long telescope at the same weight do not place the same mechanical load on the axes. Tube length, diameter, center of gravity, wind exposure, focal length, and image scale all matter along with total weight.
Tracking and Guiding
The standard CEM70AW is a precision worm-driven equatorial mount rather than an encoder-corrected mount.
Both axes use 151mm diameter, 248-tooth worm wheels, while the RA drive has a 348-second worm period. iOptron specifies native periodic error below ±5 arcseconds for the CEM70AW.
Permanent Periodic Error Correction lets the mount store a correction for the repeating component of the RA worm error. For demanding long-exposure imaging, particularly as focal length and image scale increase, conventional autoguiding remains the normal approach.
That makes the CEM70AW a sensible choice for imagers who already expect to guide. PPEC can reduce the predictable mechanical component while the guider responds to the remaining movement of the complete telescope, atmosphere, and imaging system.
If you want high-resolution encoder feedback and Real-Time Periodic Error Correction inside the mount, the CEM70EC versions are the step up from this model.
iPolar Built Into the RA Axis
The CEM70AW includes iOptron's iPolar electronic polar scope inside the mount.
Instead of looking through an optical polar scope, you connect the iPolar to a supported computer and let the software plate-solve the surrounding polar star field. It determines where the RA axis is pointing relative to the true celestial pole and then shows you how to adjust the mount's altitude and azimuth controls.
The pole star itself does not have to be visible. The camera still needs enough of the surrounding polar sky to solve successfully, but you do not have to identify Polaris or Sigma Octantis and place it on a reticle manually.
For a mount that travels, having the polar-alignment camera already inside the RA axis is especially convenient. There is no additional polar-scope camera to install every time you set up.
USB 3.0 and Through-Mount Cabling
The AW version's cable-management system is one of its most useful differences from the standard USB 2.0 CEM70.
A single USB 3.0 input at the rear of the RA axis provides the computer connection for the mount, iPolar, and the USB 3.0 hub at the saddle. Three USB 3.0 ports are available near the telescope for compatible imaging equipment.
The mount also provides power distribution near the saddle, including a 12V DC output rated to 3A and additional DC pass-through connections.
That does not make every cable disappear. Cameras and accessories still need to be connected to the appropriate power and data ports, and the electrical requirements of each device still have to be respected. The benefit is that many of those connections can terminate at the mount instead of hanging all the way down to the computer and power system below.
For a larger imaging train, that can make the system considerably cleaner and easier to manage through a full night of slews and meridian flips.
Under the Night Sky
The CEM70AW begins to earn its place when the telescope has enough aperture or focal length that the mount becomes part of image quality.
A C11 or other long-focal-length telescope can work smaller galaxies, planetary nebulae, globular clusters, and fine structures that remain tiny through a short refractor. A substantial refractor can carry a large-format camera and complete imaging train while leaving useful mechanical margin. A side-by-side configuration can use the same clear night at two different image scales.
Those systems also make proper polar alignment, balance, guiding, and a rigid support more important. The CEM70AW gives you the mechanical capacity and tracking platform while adding the USB 3.0 and wireless connectivity that make a more complicated imaging system easier to integrate.
Transportable Without Being a Small Mount
A 30 lb mount head is not grab-and-go, but it is a very different proposition from an observatory mount that weighs close to 60 pounds before the counterweights or telescope are added.
The CEM70AW can live on a backyard pier and still be moved when the occasion calls for darker skies. The included hard case protects the head during storage and transportation, and the mount separates from the tripod and counterweights in manageable pieces.
A complete CEM70 system carrying a large telescope can still become substantial equipment. We would describe it as transportable rather than lightweight. The important point is that choosing 70 lb of mount capacity does not automatically commit the telescope to one permanent observatory.
Tripod or Pier
The tripod or pier is sold separately.
iOptron lists the LiteRoc #8023ACC as a matched tripod for the CEM70 family. A permanent or more substantial pier is also a natural choice for heavier telescopes, long focal lengths, or an imaging system that does not need to travel.
With a mount capable of carrying 70 lb of telescope equipment, the structure underneath it matters. Choose the support for the complete installed system rather than the mount head alone.
Counterweights
The CEM70AW includes one 20 lb (9.5 kg) counterweight and a 28mm × 415mm stainless-steel counterweight shaft.
One counterweight is enough for many moderate telescope configurations, but heavier systems can require additional counterweight to achieve proper RA balance. The amount needed depends on the complete payload and its center of gravity.
Additional compatible 28mm counterweights are sold separately.
What's Included
- 1x iOptron CEM70AW Center-Balanced Equatorial mount head
- 1x Internal iPolar electronic polar scope
- Built-in Wi-Fi
- USB 3.0 through-mount hub and cable-management system
- 1x 8-inch spring-loaded Losmandy D / Vixen dual saddle
- 1x Go2Nova 8410 hand controller
- 1x 28mm × 415mm stainless-steel counterweight shaft
- 1x 20 lb (9.5 kg) counterweight
- 1x Hard carrying case
- 1x 12V/5A AC adapter for indoor use
- Mount connection accessories
Not included: tripod or pier, additional counterweights, iGuider.
Frequently Asked Questions
How much can the CEM70AW carry?
iOptron rates the mount for up to 70 lb (31.8 kg) of payload, excluding counterweights. Telescope length, diameter, center of gravity, focal length, and imaging requirements should be considered along with total weight.
How much does the mount head weigh?
The CEM70AW mount head weighs 30 lb (13.6 kg).
What is the difference between the CEM70AW and standard CEM70?
They share the same basic 70 lb mechanical platform, internal iPolar, worm gearing, PPEC, saddle, and major mount functions. The CEM70AW adds built-in Wi-Fi and USB 3.0 connectivity with a three-port USB 3.0 hub at the telescope end of the mount.
Does the CEM70AW include iGuider?
No. The AW includes internal iPolar, Wi-Fi, and USB 3.0. iGuider is associated with other CEM70 configurations and is not included with the CEM70AW.
Does the CEM70AW include iPolar?
Yes. iOptron's internal iPolar electronic polar scope is installed in the RA axis.
Does iPolar require Polaris to be visible?
No. Polaris itself does not have to be visible. The camera still requires enough of the surrounding polar sky for its plate solve to succeed.
What is the periodic error?
iOptron specifies native periodic error below ±5 arcseconds, measured on the bench over the mount's 348-second RA worm period.
Does the CEM70AW have PEC?
Yes. The standard CEM70AW supports Permanent Periodic Error Correction.
Does the CEM70AW need guiding?
For demanding long-exposure astrophotography, especially at longer focal lengths, guiding is the normal approach. This version does not have the high-resolution tracking encoder found on the CEM70EC models.
What does the USB 3.0 connection handle?
The USB 3.0 input provides the computer connection for the mount, internal iPolar, and three-port USB 3.0 hub at the saddle. Compatible imaging accessories can connect to those saddle-side USB ports instead of running individual data cables down the mount.
Can I control the mount over Wi-Fi?
Yes. Built-in Wi-Fi provides a wireless communication option for mount control. Actual range depends on the surrounding building, walls, interference, and network environment.
Is the CEM70AW portable?
It is transportable rather than grab-and-go. The 30 lb head and included hard case make it practical to move between sites, but a complete setup with tripod, counterweights, telescope, and imaging equipment can still be substantial.
How many counterweights are included?
One 20 lb (9.5 kg) counterweight is included. Heavier telescope systems may require one or more additional counterweights.
What dovetail plates fit the saddle?
The 8-inch spring-loaded dual saddle accepts both Losmandy D and Vixen-style dovetail plates.
What power does the CEM70AW require?
The mount uses 12V DC at up to 5A with a 5.5mm/2.5mm power connector. iOptron lists typical mount consumption at approximately 0.6A while tracking and 0.8A during GoTo. A 12V/5A AC adapter intended for indoor use is included.
What tripod should I use?
iOptron lists the LiteRoc #8023ACC as a matched tripod for the CEM70 family. A pier is also an excellent choice for heavier or permanent imaging installations.
CEM70 or CEM70AW?
If the standard CEM70's USB 2.0 connections suit your setup and your control computer is already located at the mount, the standard version may be all you need. Choose the CEM70AW when built-in Wi-Fi and USB 3.0 through the mount are useful to the way you want to wire and operate the imaging system.
Accessories
iOptron LiteRoc Tripod #8023ACC (sold separately): iOptron's matched transportable tripod option for the CEM70 family.
Additional 28mm Counterweight (sold separately): heavier telescope and imaging systems may require more counterweight than the included 20 lb weight provides.
Off-Axis Guider and Guide Camera (sold separately): particularly useful with longer-focal-length telescopes because the guider sees motion through the main optical system rather than through a separate guide scope.
Final Thoughts
The CEM70AW fills the same useful space as the standard CEM70: considerably more capacity than a mid-size imaging mount without moving all the way to a CEM120-sized head.
Its 70 lb payload gives larger telescopes and more complicated imaging trains room to grow, while the 30 lb head and included hard case preserve the option of taking that capacity somewhere else. Internal iPolar, Permanent PEC, automatic zero-position sensing, GPS, and the dual saddle provide the imaging foundation.
The reason to choose the AW version is the connection system. Built-in Wi-Fi and USB 3.0 through the mount make it easier to build a cleaner imaging train around modern cameras and accessories without giving up the transportability that makes the CEM70 attractive in the first place.
