Celestron EdgeHD 11" Optical Tube Assembly (CGE Dovetail) – 91050-XLT

The Celestron EdgeHD 14" Optical Tube Assembly (model 91060-XLT) is Celestron's flagship aplanatic Schmidt-Cassegrain telescope. Its 356mm aperture and 3910mm focal length give it the light grasp of a research instrument in a tube just 787mm long.

Unlike a standard SCT, EdgeHD optics correct both coma and field curvature. The result is pinpoint stars to the edge of full-frame and large-format astronomy cameras. That makes the EdgeHD 14 the telescope of choice for permanent observatories, university and school astronomy labs, and serious deep-sky astrophotographers.

Modern Telescopes is an authorized distributor of Celestron in India. We import the EdgeHD 14 directly, supply it with a GST invoice, and can install it on a matching mount inside a Modern Telescopes observatory dome.

Key features

• 356mm (14") aperture – gathers 2,579× more light than the human eye; limiting magnitude 15.3
• EdgeHD aplanatic optics – coma-free, flat focal plane for sharp stars across large imaging sensors and wide-field eyepieces
• Three focal ratios in one tube – native f/11, f/7 with the 0.7x reducer, or ~f/2 via Fastar with a third-party lens
• 0.33 arcsecond resolution (Dawes) – splits close double stars and resolves fine planetary detail
• StarBright XLT coatings – up to 97.4% transmission on the Schmidt corrector
• Mirror clutches – lock the primary mirror to stop image shift during long exposures
• Rear-cell cooling vents – 50-mesh filtered vents let warm air out and keep dust out
• CGE dovetail bar – fits heavy-duty mounts such as Celestron CGX-L and CGE Pro
• Individually tested – every tube is star-tested with a camera before shipping
• Accessories included – 23mm Luminos 2" eyepiece (170×), 2" mirror diagonal, 9x50 finderscope

EdgeHD optics: why a flat field matters

A standard Schmidt-Cassegrain produces sharp stars only on a curved focal surface. Camera sensors are flat, so stars toward the edge of the frame turn into comet shapes or soft blobs.

EdgeHD adds a two-element corrector lens in the baffle tube. This makes the system aplanatic – corrected for both spherical aberration and coma – and flattens the focal plane. Celestron rates the EdgeHD field as more than three times flatter than a standard SCT.

The practical gains for imagers and observers:

• Round, sharp stars to the corners of full-frame and large CMOS sensors
• Better effective resolution and limiting magnitude than a standard SCT of the same aperture
• Less need for separate field flatteners in the imaging train
• Crisper views at the edge of wide-angle 2" eyepieces

One telescope, three imaging systems

The EdgeHD 14 works as three different instruments depending on what you attach.

Adding a Barlow lens to the native f/11 setup pushes image scale higher still for lunar, planetary and solar imaging (with a certified solar filter).

Built for long-exposure imaging

The EdgeHD tube is mechanically redesigned around the needs of astrophotography, not just visual use.

• Mirror clutches: Flexible tension clutches hold the primary mirror after focusing without stressing it. This keeps the target centred on the sensor through hours of exposures.
• Cooling vents: Vents in the rear cell release warm air trapped behind the primary mirror, so the tube reaches ambient temperature faster. Each vent carries a 50-mesh filter against dust.
• StarBright XLT coatings: Applied to every optical surface for maximum throughput across the visual and photographic spectrum.
• Aluminium tube: Stable, robust construction for permanent observatory or field use.
• Factory acceptance test: Each EdgeHD is checked for optical surface quality and then imaged on an artificial star with a camera before it leaves Celestron.

Technical specifications

All figures from Celestron's official product page (source).

In the box and recommended add-ons

What's in the box: EdgeHD 14" optical tube with CGE dovetail bar, 23mm Luminos 2" eyepiece, 2" mirror star diagonal with 1.25" adapter, 9x50 finderscope.

The optical tube alone weighs 21 kg, so it needs a heavy-payload equatorial or fork mount. Cameras, guiders and dew control add further weight.

Who the EdgeHD 14 is for

• Universities, IISERs, colleges and research institutes building a teaching or research observatory
• Schools and science centres setting up astronomy labs and public outreach nights
• Advanced astrophotographers imaging galaxies, nebulae and planets with large-sensor cameras
• Remote and private observatories that need one versatile, high-resolution instrument

Why buy from Modern Telescopes

• Authorized distributor of Celestron, PlaneWave, Software Bisque and other global brands in India
• Direct import with proper GST invoice and input credit for registered businesses
• Complete observatory solutions: telescope, mount, imaging camera and motorized dome, supplied and installed
• Institutional procurement supported, including supply through GeM