Celestron Cometron FirstScope 76mm (Celestron #21023)

Published · Researched 2026-09-21

2026 lineup note: Still listed by Celestron and third-party telescope retailers, but US availability is patchy as of Sept 2026 — telescopes.net shows "No Longer Available" at $64.95 (crawled ~July 2026) while telescopesplus.com still lists it at $64.95 (crawled early Sept 2026). No successor or revision announced; the design is essentially unchanged since the Cometron edition launched. The original FirstScope (#21024) remains the other current tabletop in the line.

Version lineage (2023–2026)

• 2009: Celestron FirstScope (#21024) — launched for the International Year of Astronomy; 76mm f/3.9 tabletop Dobsonian, one included eyepiece, no finder. The scope that created the category.
• ~2015–2026: Cometron FirstScope (#21023) — special-edition Cometron variant: white tube with Cometron branding, 2 Kellner eyepieces (20mm + 10mm) and a 5×24 finderscope added vs. the original. Effectively the current "full-kit" FirstScope.
• 2023–2026: No design changes; same 300mm f/3.95 OTA on the same tabletop Dobsonian base. MSRP has held around $71.95; street has drifted between ~$57 and $72.
• Known 2026 wrinkle: at least one major US telescope retailer lists it as no longer available — possible slow discontinuation of the Cometron edition. Re-verify at celestron.com before publishing.

Overview

Celestron's Cometron FirstScope is the classic "first telescope" gift: a 76mm (3-inch) Newtonian reflector on a no-tools tabletop Dobsonian base, 4.3 lbs total, aimed squarely at kids and absolute beginners. The Cometron edition upgrades the original FirstScope with two Kellner eyepieces (15x and 30x) and a 5×24 finder, which addresses the two biggest complaints about the original (weak single eyepiece, no finder). The fast f/3.95 focal ratio gives a wide field of view suited to the Moon, comets, bright star clusters, and the Orion Nebula; planetary detail (Jupiter's moons, Saturn's rings) is possible but modest. Enthusiasts consistently describe it as "dirt cheap, light, and good fit-and-finish for the money" — and also as optically limited: the primary mirror has no provision for user collimation and the fast spherical-mirror design is not sharp at high magnification. It is a tabletop scope: no tripod, strictly for use on a table, car hood, or the ground (campsite picnic table is the canonical use case). Note the oddity that telescopesplus.com flags it "not intended for use by children under 12" — despite being marketed at kids; realistically it's fine for younger kids with adult help (that's how most families use it).

Key Specs

Pricing

• MSRP: $71.95 — Celestron list price per space.com price comparison (crawled ~2025); consistent across retailer listings.
• Street (observed): telescopesplus.com lists $64.95 (crawled early Sept 2026); telescopes.net showed $64.95 but "No Longer Available" (crawled ~July 2026); Amazon was $57.49 and Walmart $71.95 in an older comparison (crawl ~2025 — stale). European street: ~€95 (Estonia, Sept 2026) / 101 EUR (Poland, Sept 2026).
• Sept 2026 status: US availability is uneven; one major retailer appears to have dropped it. Re-verify live price and stock at celestron.com before publishing.

In the Box

Cometron FirstScope OTA (76mm f/3.95 Newtonian), tabletop Dobsonian base, 5×24 finderscope, 20mm Kellner eyepiece, 10mm Kellner eyepiece, manual. Accessory kit #CE-21024-ACC (sold separately, ~under $20) adds a moon filter and extra eyepiece options per retailer copy. No tripod, no carry bag.

Warranty

2-year telescope warranty — per First Light Optics' listing of the Cometron FirstScope (crawled early Sept 2026), consistent with Celestron's standard US telescope warranty. Re-verify at celestron.com before publishing.

Support & Parts

Celestron (Torrance, California) supports the FirstScope line through its US service center; the scope is simple enough that user-serviceable parts (eyepieces, finder, base hardware) are generic. No reported systemic support failures in community discussion; this is a low-failure product (few moving parts). Eyepieces are standard 1.25-inch, so upgrades are trivially available third-party.

Community Verdict

The FirstScope is one of the most-gifted beginner telescopes in existence, and the community consensus is affectionate but clear-eyed. Space.com gives it 4 stars and names it the best small telescope for kids — "portable, sturdy and won't break the bank." Owners on PhysicsForums ("the moon looks awesome through it and you can see Jupiter too") and a Feb 2026 First Light Optics review ("my son was well impressed with seeing the craters on the moon") confirm it delivers the two moments that hook a kid: the Moon's craters and Jupiter's moons. The enthusiast counterweight comes from Cloudy Nights, where a long thread on the 76mm FirstScope family concludes: extremely light and portable, solid mount motions, good fit-and-finish — but almost zero instructions, no primary-mirror collimation provision, and "underwhelming image quality" at higher magnifications. Several owners report using it for a few months and passing it on — it is a gateway scope, not a keeper. No fabricated scores.

Images

• [research workspace] — official Celestron studio shot, white Cometron tube on tabletop base (visual verification: "COMETRON" branding, 5×24 finder, Celestron-logo base)
• [research workspace] — official Celestron rear three-quarter view (mount knob, finder bracket)
• [research workspace] — retailer shot with the two Kellner eyepieces resting on the base
• [research workspace] — official Celestron close-up of tube rear/dust cap and base
• [research workspace] — official Celestron focuser close-up; label visible: "Cometron Firstscope 76, D=76mm, F=300mm, Model #21023"

Research date: 2026-09-20/21. Specs cross-verified across First Light Optics (crawled early Sept 2026), telescopes.net (crawled ~July 2026), telescopesplus.com (crawled early Sept 2026), and teleskopy.pl (crawled Sept 2026). Live US availability and street price are the weak points — re-verify at celestron.com before publishing.

Long-term durability & warranty-claim reality (enrichment — Sept 2026)

The FirstScope's durability story is simple: there is almost nothing to break. The OTA is a steel tube, the base is a simple Dobsonian rocker box with laminate bearing surfaces, and the focuser is a basic rack-and-pinion. Cloudy Nights owners describe "good fit-and-finish, comparable to what you'd get on much more expensive telescopes." The failure modes that do appear in long-term owner reports: the particle-board/wood base can swell if left out in dew or rain overnight (store it dry — it's a tabletop scope, not weatherproof); the stock focuser is coarse and can develop slop; and the fast f/3.95 spherical primary cannot be collimated by the user, so a hard knock that shifts the mirror cell is effectively unrepairable at home (a new scope is cheaper than a shop repair). No warranty-claim controversies surfaced in community discussion — claims are rare because the price point is low and failures are rarer. Sensible lifespan for a family scope: many years of occasional use if kept dry; the base is the part to baby.

Version history — year by year (enrichment — Sept 2026)

• 2023: Cometron FirstScope continues unchanged; street ~$57–72 US. Original FirstScope (#21024) still sold alongside.
• 2024: Continued; the Cometron binoculars line gets more attention, but the scope is untouched.
• 2025: Continued; space.com deal coverage (under $58 at Amazon) suggests healthy stock at that point.
• 2026: Continued with no revision, but telescopes.net lists it "No Longer Available" (crawled ~July 2026) while telescopesplus.com still lists at $64.95 — possible quiet wind-down of the Cometron edition. UNVERIFIED: whether Celestron has formally discontinued it; check celestron.com.

Head-to-head vs closest rivals (enrichment — Sept 2026)

No telescope rivals exist in the current 748-item catalog (verified via dedupe-list grep, 2026-09-21) — the Cometron FirstScope is the catalog's first telescope. Context against the real-world alternatives:

• vs Celestron FirstScope original (#21024): same optics and mount, but only one eyepiece and no finder. The Cometron edition's 2 eyepieces + 5×24 finder are worth the small premium — buy the Cometron if both are in stock.
• vs Sky-Watcher Heritage-76 / other 76mm tabletop Dobsonians: the generic clones are optically near-identical (same 76/300 spherical-mirror formula); the Celestron wins on fit-and-finish and finder quality. Don't pay a premium for a clone's "higher magnification" claims — 76mm of aperture is the hard limit everywhere.
• vs cheap department-store refractors (the real competitor at gift time): the FirstScope beats every 60mm "675x!!!" refractor on a wobbly tripod — the Dobsonian base is steadier than any tripod in this price class, and the low honest magnifications (15x/30x) actually show things instead of vibrating.

Care & maintenance (enrichment — Sept 2026)

Keep the base dry — the rocker-box material swells with moisture; never leave it out overnight in dew. Cap the tube when stored (dust on the primary degrades views faster than anything). Clean the mirror only if truly necessary and never wipe dry — rinse with distilled water; the SiO2 overcoat is reasonably tough but scratches are permanent. Collimation is not user-adjustable on this model, so avoid dropping or banging the tube. The 1.25-inch focuser accepts any standard eyepiece — the single best upgrade is a decent 6–9mm Plössl for ~$30 if the kid outgrows the stock Kellners.

Buying traps (enrichment — Sept 2026)

• Variant confusion: the "FirstScope" name covers the original (#21024), the Cometron (#21023), the Signature Series Moon (moon-map artwork), and the 114mm tabletop models. Listing photos get mixed up constantly on marketplaces — verify the white tube + "COMETRON" branding + 5×24 finder before buying, especially used.
• "No Longer Available" creep: at least one major US retailer has dropped it in 2026; if you want new, buy from a retailer showing live stock rather than assuming Celestron.com has it — and don't pay above the $71.95 MSRP from third-party sellers.
• The magnification trap: the box-adjacent marketing for cheap scopes screams about 100x+; on a 76mm f/3.95 spherical mirror, 30x (the included 10mm Kellner) is the sweet spot and 180x "highest useful" is a theoretical number, not a viewing recommendation.
• No tripod included, by design: don't buy a separate tripod for it — the tabletop Dobsonian base IS the mount. A folding camp table or the car hood is the accessory.

Community Verdict — additional voices (enrichment — Sept 2026)

Additional sourced voices (Sept 2026): optics-trade.eu positions it as "ideal for novice astronomers and casual stargazers… superb balance of performance and ease of access"; a telescopesplus listing carries the manufacturer's own under-12 caution flag, underscoring that adult setup help is assumed; Cloudy Nights page-4 veterans stress the honest limitation — "very limited magnification potential" and no collimation — while still calling it "dirt cheap" and "usable right out of the box." The through-line: buy it for the Moon-and-Jupiter moment with a kid at a campsite, not as an optics investment. No fabricated scores.

Key Specs gap-fill (enrichment — Sept 2026)

Weights in both units: kit 4.3 lbs = 68.8 oz = 1,950 g (1.95 kg). One retailer lists an 907 g figure for the OTA alone (desertcart.in listing) — treat as the tube-only weight, UNVERIFIED against a scale. Focal ratio f/3.95 (300/76); 20mm Kellner = 15x, 10mm Kellner = 30x; 1.78° max field of view claimed by one retailer (consistent with 300mm + ~32mm apparent-field eyepiece math — plausible). Dawes limit 1.53″, Rayleigh 1.83″, light grasp 118× vs. naked eye (First Light Optics spec table).

Dossier researched 2026-09-20/21 (social-first: community forums, retailer reviews, enthusiast boards before manufacturer copy). UNVERIFIED items: live US availability/MSRP at celestron.com, 907 g OTA-only weight. Re-verify price and stock before publishing.