The best mount in the world does not help much if you decide it is too much trouble to carry outside.
That is where the CEM26 makes a very good argument for itself. The mount head weighs only 10 pounds (4.5 kg), yet iOptron rates it to carry up to 26 pounds (12 kg) of telescope and equipment, excluding the counterweight. It is small enough to pick up without thinking very hard about it, but large enough to become the foundation of a real visual or astrophotography system.
The C261A3 package puts that light CEM26 head on iOptron's more substantial 1.75" LiteRoc tripod and includes a 10 lb counterweight. You also get internal iPolar, built-in Wi-Fi, Permanent Periodic Error Correction, and the Go2Nova hand controller.
There is no hard case in this particular package. What you are paying for is the mount, the heavier tripod underneath it, and the pieces you actually need to start using it.
Ten Pounds Is Easy to Live With
Mount weight matters in a way that specifications do not always capture. A 10-pound head is something most people can carry outside in one hand without turning setup into an event.
That portability comes from iOptron's center-balanced equatorial design. Instead of hanging most of the mount and telescope mass off one side of the tripod, the CEM layout places the combined load more directly over the center of the support.
The result is a mount head with a published payload-to-weight ratio of 2.6 to 1: 26 pounds of rated payload on a 10-pound head.
That does not mean every 26-pound telescope is automatically a good match. A long tube asks more of a mount than a compact tube of the same weight, and wind, focal length, image scale, and the position of the center of gravity all matter. iOptron itself recommends optical tubes smaller than 6" in diameter for the CEM26.
For the refractors, compact astrographs, Maksutovs, SCTs, and camera-based imaging systems that naturally fit a mount in this class, however, the CEM26 gives you useful capacity without making portability the first thing you give up.
The LiteRoc Is the Other Half of This Package
The CEM26 is available on more than one tripod, and that is worth paying attention to when comparing packages.
The C261A3 comes with iOptron's 1.75" LiteRoc stainless-steel tripod. It weighs about 16.5 pounds (7.5 kg), so it is actually heavier than the mount head sitting on top of it.
That is not a bad thing. The entire point of this combination is to keep the mount itself very easy to handle while putting a more substantial support underneath the telescope.
If you are trying to make the absolute lightest CEM26 system possible, iOptron's 1.5" tripod saves some weight. If you are carrying a longer refractor, a more complete imaging train, or simply want more tripod underneath the mount, the LiteRoc is the package I would choose.
You can still divide the system into easy pieces for transport: head, tripod, counterweight, and telescope. Nothing by itself is particularly intimidating to carry.
It Is a Small Mount, Not a Star Tracker
The CEM26 may be portable, but mechanically it is a conventional equatorial mount.
Both axes use 88mm, 144-tooth worm wheels driven by 15.2mm brass worms through synchronous belts. The RA and DEC shafts are 35mm steel riding in 55mm ball bearings, and stepper motors provide a specified motor resolution of 0.17 arcsecond.
iOptron specifies periodic error below ±12 arcseconds over the CEM26's 600-second worm period. Permanent Periodic Error Correction lets the mount store a trained correction for the repeating portion of that error.
For long-exposure deep-sky imaging, I would still plan to guide it. The mount includes an ST-4 autoguider port and can also be controlled from a computer over USB.
If you want an encoder correcting the RA drive in real time, that is the job of the CEM26EC. The standard CEM26 keeps the price down and relies on the traditional combination of good polar alignment, PPEC, and autoguiding.
Getting Polar Aligned
iPolar is built into the RA axis of this package, which removes one of the less enjoyable parts of setting up a portable equatorial mount.
Instead of looking through an optical polar scope and positioning Polaris on a reticle, iPolar uses a small camera to photograph and plate-solve the sky around the celestial pole. The software then shows you which way to adjust the mount in altitude and azimuth.
Polaris itself does not have to be visible. The camera still needs enough surrounding polar sky to identify the field successfully, so this is not a way to polar-align through a building or a completely blocked horizon. It simply means the pole star itself does not have to be part of the solution.
That is especially useful on a mount you are likely to move. Every trip to a dark site, star party, or different part of the yard means polar alignment has to be done again, and iPolar makes that a much more repeatable job.
Built for Nights Away From an Outlet
The CEM26 is also fairly modest about electricity.
iOptron specifies approximately 0.5A while tracking and 0.8A during GoTo slews from a 12V supply. In most astrophotography systems, the cooled camera, dew heaters, computer, and other accessories will consume considerably more of the field battery than the mount does.
Built-in Wi-Fi gives you another way to control the mount from compatible software without running a control cable back to your computer. It is mount communication, not a wireless USB hub, so your imaging camera and other devices still need their own computer connections.
The CEM26 does not have built-in GPS. Location, date, and time can be entered through the controller or supplied through your computer, and iOptron offers an external GPS accessory if you want that information filled in automatically.
Power-down memory is also built in, allowing the mount to retain positional information following a normal interruption or shutdown instead of treating every startup as an entirely new system.
Features
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26 lb (12 kg) payload capacity on a 10 lb (4.5 kg) mount head.
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Center-balanced equatorial design. Places the mount and payload more directly over the center of the tripod.
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1.75" LiteRoc stainless-steel tripod. Approximately 7.5 kg (16.5 lb).
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Internal iPolar electronic polar scope. Camera-based polar alignment without requiring Polaris itself to be visible.
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Periodic error below ±12 arcseconds. iOptron's published specification over the 600-second worm period.
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Permanent Periodic Error Correction. Stores a trained correction for the repeating portion of RA worm error.
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88mm, 144-tooth worm wheels with 15.2mm brass worms and synchronous belt drive.
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35mm steel axis shafts riding in 55mm ball bearings.
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Built-in Wi-Fi for wireless mount communication with compatible software.
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USB computer control and ST-4-compatible autoguider port.
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Low power consumption. Approximately 0.5A tracking and 0.8A during GoTo slews.
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Go2Nova 8409 hand controller with a database of approximately 212,000 objects.
- 3.8" spring-loaded Vixen-style saddle.
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10 lb (4.5 kg) counterweight with 20mm stainless-steel shaft and extension.
- Optional external GPS.
- Two-year limited warranty.
What Owners Say on Cloudy Nights
The LiteRoc version of the CEM26 comes up regularly in owner discussions because buyers naturally wonder whether the heavier tripod is worth carrying.
"I have a LiteRoc with my CEM26 and although it's a bit heavier, it's well made and quite stable."
That owner specifically suggested considering the LiteRoc with longer refractors or payloads above roughly 14 pounds. That number is one person's experience rather than an iOptron limit, but the reasoning is useful: as the telescope gets longer or the imaging train gets more substantial, the tripod starts to matter more.
Another CEM26 owner bought the mount specifically as a mobile system for visual observing, astrophotography, star parties, and outreach. That probably captures the personality of the CEM26 better than any payload number does. It is a real equatorial mount that is still small enough to take somewhere.
Under the Night Sky
The CEM26 is particularly enjoyable with the telescopes people tend to choose when they want to travel light.
A short refractor opens enormous pieces of sky: the North America and Pelican Nebulae together in Cygnus, the Heart and Soul in Cassiopeia, the California Nebula, or the full Andromeda Galaxy with M32 and M110 beside it. In winter, the Rosette and the broad blue reflection nebulosity around the Pleiades are natural projects for a small imaging refractor.
For visual observing, put a compact Maksutov, SCT, or refractor on the mount and let GoTo do the traveling. The Double Cluster, M81 and M82, the Orion Nebula, open clusters, double stars, the Moon, and planets are all considerably more enjoyable when the mount keeps the object centered while you look.
And because the head weighs only 10 pounds, a mediocre forecast does not require the same commitment as hauling out a much larger equatorial mount.
Sometimes that is the difference between observing and deciding to stay inside.
What's Included
- 1x iOptron CEM26 Center-Balanced Equatorial mount head
- 1x Internal iPolar electronic polar scope
- 1x 3.8" spring-loaded Vixen-style saddle
- 1x Go2Nova 8409 hand controller
- 1x iOptron 1.75" LiteRoc stainless-steel tripod, approximately 7.5 kg (16.5 lb)
- 1x Die-cast metal tripod spreader and accessory tray
- 1x 10 lb (4.5 kg) counterweight
- 1x 20mm stainless-steel counterweight shaft with extension
- 1x 100–240V AC adapter for indoor use
- Mount connection accessories
Hard carrying case is not included with the C261A3. It is available separately or included with selected CEM26 packages.
FAQ
- How much can the CEM26 carry?
- iOptron rates the CEM26 for up to 26 lb (12 kg) of telescope and equipment, excluding the counterweight. Tube length, diameter, center of gravity, wind, and imaging focal length matter in addition to weight. iOptron recommends optical tubes smaller than 6" in diameter.
- Why choose the LiteRoc version?
- The 1.75" LiteRoc is heavier than iOptron's standard 1.5" CEM26 tripod, but it puts a more substantial support underneath the same 10-pound mount head. It makes particular sense with longer tubes and more complete imaging systems.
- Can I use the CEM26 for astrophotography?
- Yes. The CEM26 is designed for both visual observing and astrophotography. For demanding long-exposure imaging, plan to use an autoguider. The mount provides an ST-4 guide port as well as USB computer control.
- CEM26 or CEM40?
- Choose the CEM26 when low mount weight and portability are the priority. The CEM40 increases payload capacity to 40 pounds, uses a larger dual Losmandy/Vixen saddle, and gives larger or longer imaging systems more room to grow.
- Does the CEM26 include iPolar?
- This C261A3 package does. The iPolar electronic polar scope is installed inside the RA axis.
- Does iPolar need to see Polaris?
- No. Polaris itself does not have to be visible, although enough surrounding polar sky must remain unobstructed for iPolar to plate-solve successfully.
- Does the CEM26 have Wi-Fi?
- Yes. Wi-Fi is built into the mount for wireless mount control with compatible software. It does not provide wireless camera data or replace a USB hub for your imaging accessories.
- Does it have GPS?
- GPS is optional rather than built in. Time and location can be entered manually or supplied through your computer, or iOptron's optional external GPS can provide them automatically.
- What dovetail does the CEM26 use?
- The standard saddle accepts Vixen-style dovetail plates. It does not directly accept the wider Losmandy D format used by the CEM40's dual saddle.
- Does this package include a hard case?
- No. A CEM26 hard case is available separately, and other CEM26 package combinations include it.
Accessories
iOptron CEM26 Hard Case (sold separately): protects the 10-pound mount head for storage and travel.
iOptron External GPS (sold separately): automatically supplies location and time information to the mount.
Guide scope and guide camera (sold separately): the usual addition when you begin long-exposure astrophotography.
iOptron iGuider (sold separately): iOptron's compact integrated guiding option for short- and medium-focal-length imaging systems.
Additional CEM26 counterweights (sold separately): available in several sizes when the telescope requires a different balance arrangement.
Final Thoughts
The CEM26 is easy to understand once you pick it up.
The head weighs ten pounds. That is light enough to carry outside without planning your evening around it, yet underneath the handle-sized proportions is a real equatorial mount with a 26-pound payload rating, iPolar, PPEC, built-in Wi-Fi, computer control, and an autoguider port.
This C261A3 package puts the heavier LiteRoc underneath it, which is a combination I like: keep the part you have to lift onto the tripod light, and put the extra weight down where it helps.
If your telescope fits comfortably within the CEM26's world, the biggest advantage may not be its payload-to-weight ratio or its electronics. It may simply be that when the sky clears unexpectedly, this is a mount you will actually carry outside.
