Celestron FirstScope Review: Tabletop Dobsonian for Kids

Quick Verdict: Ideal for Its Intended Audience

The Celestron FirstScope is the best telescope for a specific audience: children aged 6-12 who are getting their first telescope. It is simple enough that a child can set it up independently, affordable enough that parents do not worry about damage, and capable enough to show the Moon in satisfying detail. It is not a telescope for adults seeking deep-sky observation, high-magnification planetary views, or astrophotography. For those use cases, a larger Dobsonian like the Sky-Watcher Heritage 130P or a GoTo SCT is more appropriate. But as a child's first telescope that builds enthusiasm without frustration, the FirstScope excels. Its tabletop design requires no tripod — you place it on any sturdy table or flat surface, drop in an eyepiece, and point it at the Moon. This simplicity is the FirstScope's greatest strength.

Optical Performance: Lunar, Planetary and Deep-Sky Views

The FirstScope's 76mm spherical mirror and 300mm focal length deliver its best performance on the Moon. With the included 20mm eyepiece (15x), the full lunar disc fits comfortably in the field with major craters and maria clearly visible — a sight that genuinely delights first-time observers. The 4mm eyepiece (75x) provides close-up views of specific crater fields, though the spherical mirror produces soft focus at this magnification. The terminator region — the line between lunar day and night — shows the most dramatic detail, with crater walls casting sharp shadows that make the Moon's topography leap into view.

For planets, Jupiter's four Galilean moons are visible as points of light lined up on either side of the planet, and Jupiter itself shows as a small bright disc with hints of cloud banding on nights of steady seeing. Saturn's ring is detectable as a subtle elongation at 75x — a thrilling moment for a child seeing it for the first time, even though the rings are not resolved in detail. Venus shows a crescent phase. Mars appears as a small reddish disc at opposition. The Orion Nebula (M42) appears as a small, bright hazy patch — not the detailed structure seen through larger telescopes, but a legitimate deep-sky object that young observers can tick off their bucket list. The Pleiades (M45) shows as a compact group of stars.

The 76mm aperture gathers 20% more light than a 70mm refractor, but the spherical mirror and central obstruction mean contrast is lower than a refractor of similar aperture. The 4mm eyepiece included in the box provides 75x magnification, which is close to the maximum useful magnification for this aperture. At this power, the spherical aberration from the mirror is noticeable — stars appear as soft discs rather than sharp points. The 20mm eyepiece provides a more satisfying wide-field experience at 15x, making the FirstScope best suited for low-power sweeping of the Moon and brighter star clusters. Under dark skies, the Milky Way star clouds are visible, and brighter open clusters like the Double Cluster in Perseus are detectable as two patches of unresolved light. For dimmer deep-sky objects like galaxies, the 76mm aperture is simply too small — the Andromeda Galaxy is visible as a faint smudge only under pristine dark skies.

Maintaining the FirstScope

The FirstScope is a small Newtonian reflector, which means it uses a primary mirror at the bottom of the tube and a secondary mirror near the top to direct light to the eyepiece. Newtonian reflectors require occasional collimation — the alignment of these two mirrors. The FirstScope's spherical mirror is more forgiving of slight misalignment than a parabolic mirror, but the collimation should still be checked periodically, especially if the telescope has been transported or bumped. The secondary mirror is adjusted by turning three small screws on the back of the secondary mirror holder. The primary mirror is adjusted by three screws at the bottom of the tube. A collimation cap (a simple plastic cap with a small centre hole) is the easiest tool for beginners — it replaces the eyepiece and lets you centre the secondary mirror in the primary mirror's reflection. The primary mirror should also be cleaned very rarely — only when dust accumulation is visibly affecting the image. Use a bulb blower for loose dust and distilled water on a lens tissue for stubborn spots. Never use household cleaning products on the mirror surface. The tube's open end should be covered when not in use to prevent dust and debris from entering.

Best Targets for the FirstScope

Despite its small aperture, the FirstScope can show a surprising number of objects when you know what to look for. The Moon is the undisputed showpiece — observe along the terminator (the line between lunar day and night) where crater walls cast dramatic shadows that reveal the Moon's three-dimensional topography. Start with a crescent or quarter Moon when the terminator runs through the most interesting crater fields. Jupiter shows its four brightest moons as distinct points of light, and the planet itself appears as a small bright disc with subtle banding visible on steady nights. Saturn's ring is detectable at 75x as a slight elongation — not the detailed ring system of larger telescopes, but a legitimate observation that excites young astronomers. The Orion Nebula appears as a bright hazy patch with a distinctly brighter centre — the Trapezium stars are not individually resolved but the overall glow is unmistakable. The Pleiades cluster shows a compact group of stars. Brighter double stars like Albireo (gold and blue components) and Mizar and Alcor in the Big Dipper are excellent targets for teaching young observers about binary star systems.

Build Quality and Tabletop Design

The FirstScope's build quality reflects its price point and target audience. The optical tube is a lightweight aluminium tube with a painted finish. The tabletop Dobsonian base is made from particle board with a textured coating — it is functional but not weather-resistant. The mount works on the Dobsonian principle: the tube rests in a U-shaped cradle that pivots up and down (altitude), while the entire cradle rotates on a lazy Susan bearing (azimuth). This design is inherently stable because the centre of gravity is low. The motion is smooth enough for low-power observing, though it can be sticky at times. A small dab of lithium grease on the bearing surfaces improves the motion significantly. The entire telescope weighs approximately 5 pounds, making it easy for a child to carry from the house to the backyard.

The StarPointer red dot finder is a simple reflex sight that projects a red dot onto a window. The finder requires two coin-cell batteries (CR2032, included) and has a brightness control wheel. Unlike optical finderscopes, the StarPointer does not magnify — you look through the window and place the red dot on your target. This is much easier for children to use than a traditional finderscope, though the red dot can be hard to see against bright city backgrounds. The eyepiece holder is a standard 1.25-inch rack-and-pinion focuser with moderate plastic construction. The focus travel is smooth but has some play. The included 20mm and 4mm eyepieces are Kellner designs — acceptable for budget use but limited by their narrow apparent fields and modest eye relief. The 4mm eyepiece in particular requires you to position your eye very close to the lens, which can be challenging for glasses wearers.

FirstScope vs. Other Beginner Telescopes

The FirstScope competes with several other beginner telescopes in the under-$100 price range. The Celestron PowerSeeker 60AZ is a 60mm refractor on an alt-azimuth tripod — it offers a more familiar telescope form factor but requires tripod setup and alignment. The FirstScope's tabletop Dobsonian design is simpler to use: no tripod leveling, no finderscope alignment, no equatorial mount complexity. The Gskyer 70mm refractor offers slightly more aperture with a traditional tripod mount, but the FirstScope's Dobsonian mount is more stable at the same price. The PowerSeeker 70AZ is another option, but its tripod mount is less stable than the FirstScope's low centre of gravity. Among these options, the FirstScope is the best choice for young children because of its simplicity, stability, and low weight. For teenagers and adults, the Heritage 130P offers a parabolic mirror, larger aperture, and collapsible design that provides room to grow. For a comprehensive comparison, see our best telescopes for beginners guide and best telescopes under $100 guide.

Pros and Cons at a Glance

Guide for Parents: Getting the Most from the FirstScope

If you are buying the FirstScope for a child, a small amount of preparation on your part will dramatically improve their experience. First, set up the telescope during daylight hours to ensure everything works before the night sky is visible. Install the StarPointer finder batteries, attach the finder bracket, and check that both eyepieces fit smoothly in the focuser. Second, practice focusing: point the telescope at a distant tree or building during the day and turn the focus knob until the image is sharp. Show your child how the focus changes at different distances. Third, start with the Moon — it is bright, easy to find, and the detail is immediately rewarding. The FirstScope's 20mm eyepiece provides the best wide-field Moon view. The 4mm eyepiece is for close-up views of specific craters.

Fourth, manage expectations about planets. Show your child pictures of what Jupiter and Saturn look like through small telescopes on our what you can see with a telescope guide. A child expecting the Hubble image of Saturn will be disappointed, but a child expecting a small disc with ring-like elongation will be genuinely excited. Fifth, keep sessions short — 20 to 30 minutes is ideal for young children. Let the child lead the observing, choosing which targets to look at. Sixth, the FirstScope can be used indoors as a spotting scope for distant objects during the day — birds in a backyard feeder, a distant flag, or a mountain view — which helps build familiarity with the telescope's operation before night-time astronomy. For more practical tips, see our guide to how to choose and use a telescope.

Recommended Accessories and Upgrades

The FirstScope ships with a 20mm and 4mm Kellner eyepiece, a StarPointer finder, and a printed sky map. Several inexpensive upgrades can improve the experience. A 12mm or 15mm eyepiece fills the gap between the 20mm (15x) and 4mm (75x) — providing approximately 20-25x magnification that is ideal for lunar full-disc views with more detail. A moon filter threads into the eyepiece barrel and reduces the Moon's glare, making extended lunar observation more comfortable. A 2x Barlow lens doubles the magnification of any eyepiece, effectively giving you 30x with the 20mm and 150x with the 4mm (though 150x exceeds the FirstScope's useful limit). For children who show sustained interest, a copy of the book "Turn Left at Orion" is an excellent companion that teaches observing skills through simple diagrams and target descriptions.

A solar filter is an excellent addition for daytime solar observing — but only a certified white-light solar filter that fits securely over the front of the tube. Never use eyepiece solar filters, as they can crack from concentrated heat. With a proper solar filter, the FirstScope shows sunspots, solar granulation, and the dark penumbra around sunspot umbrae. This extends the telescope's usefulness beyond night-time hours and provides a safe introduction to solar astronomy. A simple green laser pointer attached to the tube makes aiming faster for older children and adults. For more guidance on safe solar observing, see our solar observing guide. For more eyepiece recommendations, see our best telescope eyepieces guide.

Alternatives to the FirstScope

The FirstScope occupies a very specific niche — an under-$100 tabletop telescope for young children. Several other telescopes serve adjacent niches. The Celestron PowerSeeker 60AZ is a 60mm refractor on an alt-az tripod that offers a more traditional telescope experience for a similar price — the tripod mount is less stable than the FirstScope's Dobsonian base, but the refractor design requires no collimation. The Celestron Travel Scope 70 is a 70mm refractor on a photo tripod that is more portable and versatile for both terrestrial and astronomical use. The PowerSeeker 80EQ is an 80mm refractor on an equatorial mount that teaches EQ operation — suitable for older children and teenagers who want to learn tracking. The StarSense Explorer LT 114AZ is the logical next step up with smartphone-assisted navigation and significantly larger aperture. For a complete comparison of beginner telescopes across price points, see our best telescopes for beginners guide.

Long-Term Value and Upgrade Path

The FirstScope is designed as an introductory telescope, and most users will outgrow it within 6 to 12 months as their observing skills develop. This is by design — the FirstScope is a gateway instrument that builds enthusiasm without requiring a large financial commitment. When the user is ready to upgrade, the most natural progression is to the Sky-Watcher Heritage 130P (a 130mm collapsible Dobsonian with a parabolic mirror) or the Celestron StarSense Explorer LT 114AZ. Both offer significantly larger aperture with true parabolic optics that reveal dramatically more detail on planets and deep-sky objects. For users who develop an interest in astrophotography, the Celestron NexStar 4SE or 5SE provide GoTo tracking capabilities. The FirstScope itself retains some value as a quick-look lunar scope, travel companion, or loaner telescope even after upgrading. For a complete upgrade path, see our best telescopes for beginners guide.

First-Time Setup Guide

Setting up the FirstScope for the first time is straightforward, but following a systematic approach ensures success. Start by removing all components from the box: the optical tube assembly, the Dobsonian base, the StarPointer finder, the two eyepieces, and the printed sky map. Attach the StarPointer finder to the tube by sliding its bracket into the dovetail slot on the tube and tightening the thumbscrew. Insert the CR2032 battery into the StarPointer finder — the battery is included and is located under a small screw cap. Place the Dobsonian base on a sturdy, level table or surface. Set the optical tube into the U-shaped cradle of the base — the tube should rest freely with the eyepiece pointing upward. Install the 20mm eyepiece by loosening the thumbscrew on the focuser, inserting the eyepiece barrel, and tightening the thumbscrew. During daylight hours, aim the telescope at a distant object (at least 100 metres away), centre it in the eyepiece, and adjust the StarPointer's alignment screws until the red dot points at the same object. The finderscope alignment is the most important preparation step — it makes finding targets at night vastly easier. Once aligned, the FirstScope is ready for its first night-time observation. The entire setup process takes approximately 15 minutes for a first-time user and less than 5 minutes for subsequent sessions.

Frequently Asked Questions

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