Celestron EdgeHD 925 OTA - 9.25" f/10 HD Aplanatic Optical Tube Assembly - CGE Dovetail — image 1
Celestron

Celestron EdgeHD 925 OTA - 9.25" f/10 HD Aplanatic Optical Tube Assembly - CGE Dovetail

The bare 9.25-inch EdgeHD tube: aplanatic, flat-field optics that keep stars pinpoint to the edge, for the imager or observer who wants Celestron's best SCT correction on a mount of their own choosing.

88/ 100
Polaris Score
#1 of 6 aplanatic imaging SCT OTA
See the breakdown ↓
Aperture
235mm
Focal Length
2350mm
Focal Ratio
f/10
Mount Type
None (OTA only)
Optical Design
Schmidt-Cassegrain (EdgeHD)
Weight
9.5 kg
From$2,799

Lowest in 90 daysLowest ever tracked

Price tracked by PolarisObserved 61 timesTracking since Mar 2026

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Where to buy

Verified 13h ago · prices tracked daily

What it's built forOpen these in the simulator →

This telescope lives for the planets.

An f/10 focal length built to magnify. Where fast scopes sweep wide, this one holds a single planet rock-steady at high power — a telescope for the patient observer on a steady night.

Sweet spot 180–290×Loves steady seeing
The view people remember

Jupiter and its four moons.

Cloud belts stripe the disk and the Galilean moons shift positions night to night — on a steady evening the Great Red Spot rotates into view.

See Jupiter through this telescope →
01What it's good at

What it's best at — and the trade-offs.

EdgeHD optics correct coma and field curvature, so stars stay sharp across the whole frame for imaging
Best at
✓EdgeHD optics correct coma and field curvature, so stars stay sharp across the whole frame for imaging
✓235mm at 2350mm reaches high magnification on planets and gathers enough light for many deep-sky objects
✓The 9.25-inch tube has a longstanding reputation for exceptional planetary sharpness
✓As a bare OTA it drops onto any capable mount you own or plan to buy, giving full control of the rig
Trade-offs
!It is an OTA only, so budget for a mount that can carry it or it does nothing
!f/10 is slow for deep-sky imaging without a reducer
!The corrector plate dews and the closed tube takes time to reach thermal equilibrium
!Mirror flop and focus shift are inherent to moving-mirror SCTs and matter for imaging
02In plain English

What These Numbers Mean

235mm · f/10 · 2350mm FL
Aperture
235 mm (9.25 inch)
Nine and a quarter inches sits in a genuinely useful gap: about 35 percent more light than an 8 inch, while the tube remains a one-person lift. The 9.25 optical design has a long reputation for sharp planetary performance.
Focal length
2350 mm
Long focal length gives high magnification easily and frames small targets such as planetary nebulae and compact galaxies well. Wide fields require the reducer or a second scope.
Focal ratio
f/10
Slow optics: excellent for visual high power, demanding for imaging, where long exposures and accurate guiding are needed. The 0.7x EdgeHD reducer takes it to f/7 for deep-sky work.
Optical design
EdgeHD Schmidt-Cassegrain
Aplanatic corrective optics flatten the field so stars stay round across large sensors, which a standard SCT cannot do. It also improves the outer field visually with wide-angle eyepieces.
Weight
9.5 kg tube
About 21 lb, compact enough to carry to the mount in one hand and a support. Loaded with camera and accessories, plan on a mount rated at 20 kg or more.
Cooldown
60 to 90 minutes
Larger corrector plates and mirrors hold heat longer. Until the tube matches the air temperature, planetary detail stays soft, so an early setup or a fan makes a visible difference.
03The Polaris Score

How it scores, and why.

88/100 · #1 of 6 aplanatic imaging SCT OTA
88/ 100
Celestron EdgeHD 925 OTA - 9.25" f/10 HD Aplanatic Optical Tube Assembly - CGE Dovetail
#1 of 6 aplanatic imaging SCT OTA
Performance
94
Ease of use
65
Portability
50
Upgrade potential
85

Polaris weighs optical capability, how easy the scope is to live with, how portable it is, and how far it takes you before you outgrow it — not list price or brand.

04Who it's for

An honest fit check.

Imagers who want a flat-field SCT tube and already own or plan a capable mount
Buy it if you
✓Imagers who want a flat-field SCT tube and already own or plan a capable mount
✓Planetary and lunar observers who want maximum sharpness from a transportable tube
✓People ready to grow into deep-sky imaging on their own equatorial mount
Look elsewhere if you
!First-time buyers who need a complete, ready-to-use scope out of the box
!Wide-field fans, since f/10 and 2350mm give a narrow field
!Anyone without a mount rated to carry a 20-plus-pound tube steadily
05Build your rig

What to buy next — and where it leads.

11 pieces of gear, ordered by what changes the view most
Recommended upgrades
A sharper everyday view★ Top pickTele Vue Nagler 22mm Type 4

A premium 2-inch wide-field eyepiece for the widest true field

Sharper planets & lunar detailTele Vue Delos 6mm

A premium high-power eyepiece for planetary detail

No fogging on long sessionsPegasus Astro Multi-Channel Dew Controller

Keeps the corrector plate clear on humid nights

Imaging path
Portable astrophotographyZWO AM5N Harmonic Equatorial Mount✓ Compatible

Start capturing images of the Moon and planets

Permanent-setup astrophotographySky-Watcher EQ6-R Pro✓ Compatible

Commonly paired with this telescope

Start imagingZWO ASI2600MC Pro

Start capturing images of the Moon and planets

Accessories
A sharper everyday viewCelestron X-Cel LX 18mm

Commonly paired with this telescope

Double your magnificationTele Vue 2x Barlow 1.25-inch

Doubles magnification for closer planetary detail with this telescope

Tame lunar glareGSO Moon Filter 13pct 1.25-inch

Improves contrast on nebulae and planets with this setup

Show all compatible accessories (5) →
Lunar & planetary
Excellent
Deep-sky imaging
Ready once mounted
Visual observing
Strong all-rounder
06The numbers

Full specifications.

6 measured and stated values
Optics
Optical DesignSchmidt-Cassegrain (EdgeHD)
Aperture235mm
Focal Length2350mm
Focal Ratiof/10
Mount & drive
Mount TypeNone (OTA only)
Physical
Weight9.5 kg
07Alternatives

For a different goal, start here.

3 alternatives, each mapped to the goal it wins at
Smaller and lighter

Celestron EdgeHD 8

The 8-inch EdgeHD tube if 9.25 inches is more than your mount can carry

→
More aperture

Celestron EdgeHD 11 OTA

The 11-inch EdgeHD for greater light grasp on a bigger mount

→
Standard SCT for less

Celestron C9.25 Schmidt-Cassegrain OTA

The classic 9.25 optics without the flat-field EdgeHD correction, at a lower price

→
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Community

Used in these setups.

Real builds from the community that include this product.

Galaxy Hunter

Featured

A long-focal-length one-shot-color imaging rig built around the Celestron EdgeHD 9.25. The flat, edge-corrected field and a 0.7x reducer bring galaxies and compact planetary nebulae within reach, while the EQ6-R Pro carries the tube steadily through long exposures.