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Large silver optical tube assembly with black accents and 1100 markings

Celestron

Celestron EdgeHD 1100 11in Optical Tube Assembly

SKU CH-G6NN-N2405

An 11-inch Schmidt-Cassegrain optical tube assembly delivering flat-field, aberration-free views with StarBright XLT coatings for visual and photographic use

  • TypeTelescopes
  • Aplanatic flat-field design delivers pinpoint stars across the full sensor
  • StarBright XLT coatings maximise light throughput for brighter deep-sky views
  • 11-inch aperture gathers abundant light to resolve faint detail
  • 1100 mm focal length provides versatile imaging scale for many targets
  • True astrograph quality keeps stars sharp to the very edge of the field

EdgeHD 1100 optical tube

The EdgeHD 1100 is an 11-inch Schmidt-Cassegrain optical tube assembly built for aberration-free, high-definition celestial observation. Its aplanatic, flat-field design delivers pinpoint stars across a wide visual and photographic field, making it suitable for serious amateur astronomers and professional imaging.

Flat-field imaging limits

The flat focal plane ensures stars remain in focus to the edge of a digital camera sensor, providing true astrograph quality without field curvature. However, the fixed native focal ratio and back-focus distance restrict flexibility for some sensor formats or reducer combinations, and vignetting can appear with very large-format sensors.

Installation and common issues

The optical tube mounts via a standard dovetail bar to compatible equatorial or alt-azimuth mounts, but its 11-inch aperture adds significant weight that requires a sturdy, high-capacity mount for stable tracking. Collimation is factory-set and rarely needs adjustment, though the Schmidt corrector plate can dew heavily in humid conditions, so a dew shield or heater is often necessary for long imaging sessions.

Highlights

  • Aplanatic flat-field design delivers pinpoint stars across the full sensor
  • StarBright XLT coatings maximise light throughput for brighter deep-sky views
  • 11-inch aperture gathers abundant light to resolve faint detail
  • 1100 mm focal length provides versatile imaging scale for many targets
  • True astrograph quality keeps stars sharp to the very edge of the field

Specifications

BrandCELESTRON
TypeTelescopes

Questions about this item

Which EdgeHD 1100 optical tube assembly should I choose?

The EdgeHD 1100 is an 11‑inch Schmidt‑Cassegrain optical tube assembly supplied as a single configuration; there are no alternate versions or capacities to select.

What does the 11‑inch aperture mean when I use the telescope?

The 11‑inch aperture gathers substantially more light than smaller tubes, revealing fainter deep‑sky objects and delivering higher resolution for planetary detail.

What imaging standard does the flat‑field design support in practice?

The aplanatic flat‑field Schmidt‑Cassegrain design keeps stars sharp to the edge of a full‑frame camera sensor, making it suitable for wide‑field astrophotography.

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