Smart Telescopes Compared by Spec

Sort smart telescopes by what you want to see and how far you will carry it. For detail on small targets, the 85 mm and 114 mm Unistellar units have the finest image scale. For a wide field, the Vaonis and Seestar units cover 2.5° to 4.6°. For travel, the DWARF mini weighs 840 g.

We compared 12 units from 5 makers. Every number below comes from a maker spec page, checked on 2026-10-23. Where a maker did not list a spec, we wrote not listed.

Two formulas explain most of the table. Field in degrees is sensor width ÷ focal length × 57.3. Image scale in arcseconds per pixel is pixel size in µm ÷ focal length in mm × 206.

Read aperture and focal length first. Aperture sets how fast the unit gathers light. Focal length sets how large a target looks on the sensor.

Then read the field. A field over 2° fits large nebulae and star fields in one frame. A field under 1° suits galaxies and planets, but large targets need a mosaic.

Weight and battery come last, but they decide how often you use it. Units under 2 kg go anywhere in a backpack. Units near 7 kg plus a tripod need a car.

The Seestar S50, DWARF II and Celestron Origin Mark II are in the table for reference. We list their specs so you can compare them with the units in each group.

The Origin Mark II is a different class. It uses a 152 mm RASA at f/2.2 and weighs 18.9 kg as a system. It runs on external power and suits a fixed site or a backyard.

An 85 mm mirror at 320 mm gives the finest image scale here, 0.93 arcseconds per pixel. That is about 4 times finer than a 30 mm unit at 150 mm.

The Unistellar Odyssey uses that 85 mm, 320 mm optic at f/3.9. It focuses itself and needs no collimation. The maker lists 4 kg for the telescope and 2.5 kg for the tripod, with 5 h per charge.

Its field is 0.75° by 0.56°. That suits galaxies, planetary nebulae and planets. Large targets such as the Andromeda Galaxy need a mosaic.

On Jupiter at about 45 arcseconds, 0.93″ per pixel gives a disk about 48 pixels wide. Cloud bands show. On a 30 mm unit the same disk spans about 11 pixels.

The sensor is a 3.4 MP IMX415. The maker lists a limiting magnitude of 17.2 for the 85 mm units. That is faint enough for many galaxies from a suburban site with a long stack.

Some owners want to put an eye to the telescope. The Odyssey Pro and eVscope 2 add a Nikon electronic eyepiece. It shows the live stacked image on a small screen inside the eyepiece.

The Odyssey Pro uses the same 85 mm, 320 mm optics as the Odyssey. So field, scale and battery are the same. Only the eyepiece and accessories differ.

The electronic eyepiece is not a glass view. It shows the camera image, stacked as it builds. It helps on a bright night when a phone screen washes out your dark adaptation.

The eVscope 2 pairs the same eyepiece with the 114 mm, 450 mm optic. The maker lists 9 h of battery and 7 kg plus a 2 kg tripod. It needs collimation, unlike the 85 mm units.

A 114 mm mirror gathers about 1.8 times the light of 85 mm. On the same target, it reaches a given noise level in less time. The maker lists a limiting magnitude of 18.2 for the 114 mm units.

The Unistellar eQuinox 2 uses a 114 mm, 450 mm optic at f/4. Its field is 0.76° by 0.57°, close to the 85 mm units. Its scale is 1.33″ per pixel with a 6.2 MP sensor.

The maker lists 11 h of battery, the longest here with the Vespera Pro 2. The trade is weight: 7 kg for the telescope and 2 kg for the tripod. Focus is manual and the mirror needs collimation.

For many owners, the choice between 85 mm and 114 mm comes down to weight. The 85 mm units weigh 3 kg less. The 114 mm units gather more light and run longer per charge.

The 114 mm units also have a slightly coarser scale than the 85 mm units, since their pixels are larger. At 1.33″ per pixel they still sit below the limit set by the air on most nights.

Vaonis builds 50 mm refractors in a closed, one-piece design. The Vespera II pairs a 50 mm, 250 mm lens with an 8.3 MP IMX585 sensor. Its field is 2.5° by 1.4°.

That field fits large nebulae, the Pleiades and wide galaxy pairs in one frame. Its scale is 2.39″ per pixel, near the limit set by the air on a typical night.

The maker lists 5 kg and 4 h per charge, with 25 GB of storage. The Vespera Pro 2 uses a 12.5 MP square sensor at 245 mm for a 1.6° by 1.6° field, with 11 h and 225 GB.

A square field like the Pro 2 suits round targets. A wide field like the Vespera II suits long ones. Both are refractors, so neither needs collimation.

The Vaonis units fold into a closed body with no exposed optics. That keeps dust off the lens in storage. At 5 kg they are heavier than the Seestar and DWARF units, but they carry in one hand.

The Seestar S30 Pro is a 30 mm, 160 mm refractor at f/5.3 with an IMX585 sensor. Its field is 4.6° on the diagonal, the widest of the main cameras here.

It adds a second wide camera at 6 mm with a 63° field for finding targets. The maker lists 1.65 kg, about 6 h on a 6,000 mAh battery and 128 GB of storage.

Built-in filters include UV/IR cut, dual-band and dark. The dual-band filter helps on emission nebulae from a city. The unit runs in alt-az and has an EQ mode for longer exposures.

The Seestar S50 is the larger sibling at 50 mm and 250 mm. Its 1920 × 1080 IMX462 sensor gives 1.29° by 0.73°. It weighs 2.5 kg, so the S30 Pro trades aperture for weight and field.

At 3.74″ per pixel, the S30 Pro favors large targets. Small galaxies look small. Planets show as bright disks with a hint of detail.

The DWARF mini weighs 840 g, or 1.85 lb. It measures 184 × 100 × 61 mm and takes a 1/4 in tripod thread. The tripod is not included.

Its 30 mm, 150 mm lens at f/5 feeds a 1920 × 1080 IMX662 sensor. The field is 2.13° by 1.20°, with 2.45° on the diagonal. Scale is 3.99″ per pixel.

The maker lists a 7,000 mAh battery for up to 4 h and 64 GB of storage. EQ mode allows exposures up to 90 s. Built-in filters are dark, astro and dual-band.

At 840 g, the DWARF mini fits in a jacket pocket with a light tripod. That makes it the unit you take on trips where a 5 kg case would stay home.

The trade is aperture and scale. A 30 mm lens gathers about one eighth the light of an 85 mm mirror. Faint targets need longer stacks to look smooth.

The DWARF 3 pairs a 35 mm, 150 mm telephoto with a 6.7 mm wide camera at 50.6°. The telephoto uses an 8.3 MP IMX678 with 2 µm pixels. Its field is 3.38° on the diagonal.

The maker lists 1.35 kg, a 10,000 mAh battery for up to 5.5 h and 128 GB. Filters are VIS, astro and dual-band. It has AZ and EQ modes and a 2 × 2 mosaic mode.

The 2 µm pixels give 2.75″ per pixel at 150 mm. That is finer than the DWARF mini or S30 Pro, though still coarse for planets.

The DWARF II is the earlier model at 24 mm and 100 mm. It weighs about 1.2 kg and runs about 3 h. The DWARF 3 adds aperture, battery and storage.

Built-in dual-band filters help most from a city on emission nebulae. They do little for galaxies. The Seestar and DWARF units list them. The Vaonis and Unistellar pages we checked did not list a built-in filter of this type.

Storage fills fast if you keep raw frames. A 1-hour session of 10 s frames at 8.3 MP can take several GB. Units with 25 GB to 64 GB need regular transfers.

A dark site beats any filter for galaxies. Even 30 minutes of driving can cut sky glow enough to show faint outer arms that a city stack misses.

A narrow field does not rule out large targets. Some units shoot a mosaic: the mount points at overlapping panels and the software joins them.

The DWARF 3 lists a 2 × 2 mosaic mode. The Vespera Pro 2 lists a mosaic mode as well. A 2 × 2 mosaic roughly doubles the field in each direction, less the overlap.

The trade is time. Each panel needs its own stack. A 4 panel mosaic at 30 minutes per panel takes 2 hours, so it suits long, clear nights.

Megapixels set the size of the saved image, not the detail on the target. A larger sensor with the same pixels gives a wider field. Detail comes from pixel size and focal length together.

The Seestar S30 Pro and Vespera II share an 8.3 MP IMX585. The S30 Pro at 160 mm shows a 4.6° field. The Vespera II at 250 mm shows 2.5° by 1.4° with finer scale.

The Odyssey uses 3.4 MP at 320 mm. Its image has fewer pixels, but each covers less sky. On small targets it shows more detail than a larger file from a wider unit.

No unit here does both a wide field and a fine scale. A 4.6° field at 3.74″ per pixel is the opposite of a 0.75° field at 0.93″ per pixel.

Pick a wide field if your list is large nebulae and star fields. Pick a fine scale if your list is galaxies, small nebulae and planets. If you want both, plan on two units or on mosaics.

The air sets a limit at 2″ to 3″ on most nights. So the gain below 2″ per pixel is real on good nights and small on poor ones.

Also check the app. Each maker has its own. Look for raw file export, mosaic modes and how often the maker updates it.

Check what is in the box. Some units ship with a tripod and some do not. The DWARF mini does not include one.

Check the case too. Small units often fit a camera bag. For larger units, a fitted case or backpack protects the optics on car trips.

Finally, check the storage and Wi-Fi range. Most units make their own Wi-Fi network. Range is usually enough for a backyard, but a wall or a car body can cut it.

We read each maker spec page for aperture, focal length, sensor, field, weight, battery, storage and filters. We computed field and scale with the two formulas above, and used maker values where they were listed.

We did not score image quality and did not compare prices. Prices and stock change, so check the retailer page for current details. Specs here are as of 2026-10-23.

Models change quickly. We note the check date on every row. If a maker updates a spec, the maker page wins.

Most smart telescopes are built for deep sky. Galaxies, nebulae and clusters are faint and large, so they suit short focal lengths and long stacks.

Planets are bright and small. Jupiter spans about 45 arcseconds, Saturn's rings about 40 and Mars at its closest about 25. They need a fine scale and many short frames.

On a 30 mm, 150 mm unit, Mars at 25 arcseconds spans about 6 pixels. On an 85 mm, 320 mm unit it spans about 27 pixels. Neither matches an 8 in Dobsonian at 200x by eye.

So if planets come first, pick the longest focal length you can carry. If deep sky comes first, any unit here works, and field is the bigger choice.

Every unit here tracks in alt-az. In that mode the field slowly rotates during a long stack. Most apps limit frames to 10 s to 30 s and crop the rotated edges.

The Seestar S30 Pro, Seestar S50, DWARF 3 and DWARF mini list an EQ mode. You tilt the base toward the celestial pole. Then the field holds still and frames can run longer.

The DWARF mini lists exposures up to 90 s in EQ mode. Longer frames cut read noise per hour of data. On a dark site that helps faint targets the most.

All units here follow the same steps. Level the tripod, power on, connect the phone and let the unit solve its position. That takes a few minutes.

Pick a bright target first. A star cluster or a bright nebula shows results in 5 to 10 minutes. It builds confidence before you try a faint galaxy.

Keep the phone charged. The app streams images over Wi-Fi, which drains the phone faster than the telescope. A small power bank for the phone helps on long nights.

Dew is the other common stop. On humid nights the front lens or window fogs. A dew shield or a USB heater strip keeps it clear.

Battery specs run from about 3 h to 11 h. Cold cuts that. Below about 0 °C, plan for less than the maker figure.

Most small units charge over USB-C. Check the input spec before you buy a power bank. The Seestar S30 Pro lists 5 V at 3 A. A bank with 30 W output covers it with margin.

A sturdy tripod matters more on light units. An 840 g unit on a thin tripod shakes in wind. A heavier tripod with a 1/4 in thread steadies it.

Each maker has its own app. The app finds targets, runs the stack and saves results. Check that it runs on your phone or tablet before you buy.

Raw export lets you process data on a computer later. Most units here offer it. Raw files fill storage fast, so plan regular transfers.

Some apps share a target list across owners or run group observing events. Unistellar runs citizen science campaigns with its units. Those features vary by maker and change over time.

A classic telescope shows a live view through glass. On planets and the Moon, an 8 in Dobsonian shows more fine detail to the eye than any unit here shows on a screen.

A smart telescope shows color and faint structure that no eye sees at the eyepiece. It works from a city with a filter, needs no star charts and finds targets itself.

Many owners keep both. The smart unit runs a stack on a nebula while they look at a planet through the classic telescope.

The 85 mm and 114 mm Unistellar units suit an owner who wants detail on galaxies and small nebulae and can carry 6 kg to 9 kg. They suit a balcony or a backyard with a short walk.

The Vaonis units suit an owner who wants a wide, clean field and a closed body. They suit a garden or a car trip to a dark site.

The Seestar S30 Pro suits an owner who wants the widest field in a light unit. It suits travel, hikes and a first smart telescope.

The DWARF mini suits an owner who wants the lightest unit and has a tripod already. The DWARF 3 suits an owner who wants two cameras, more battery and a mosaic mode in a small body.

Keep the unit in its case between sessions. Dust on a front lens or window shows up as soft halos around bright stars.

Bring a cold unit inside and leave it in the closed case for an hour. That lets it warm slowly and keeps moisture off the optics and electronics.

Charge the battery to about half for long storage. Most lithium cells keep better that way than at full charge. Check the maker guidance for your unit.

Update the app and firmware before a trip, not at the site. Updates can take several minutes and need a good connection.