Astronomy Specialist

CELESTRON EDGEHD 925

$2,999.00 USD
SKU: CE-91040-XLT

Celestron

Aplanatic Schmidt-Cassegrain

235 mm

f/10

2350 mm

9.53 kg


 

The Celestron EdgeHD 925 is an aplanatic flat field Schmidt-Cassegrain which provides aberration-free images across a wide field of view. A true astrograph, the EdgeHD 925 provides a 42mm image circle, making it suitable for full frame sensors

Celestron's EdgeHD series combines the strengths of Schmidt-Cassegrains with imaging performance of modern Corrected Dall-Kirkham designs, all in an affordable package. The classic SCT is well corrected on-axis but suffers from coma and field curvature, making them unsuitable for deep sky imaging. By adding a two-element corrector lens and optimizing the overall optical design, the EdgeHD solves these problems while keeping costs low for a full frame-corrected instrument. The EdgeHD series includes Celestron's StarBright XLT optical coatings on each surface, giving maximum light transmission across the visual and photographic spectrum between 400 - 750nm.

In addition to the optimized optical design, the EdgeHD includes flexible tension mirror clutches which reduce image shift over long exposures. This allows the mirror to be held securely in place without putting additional force or pressure on the mirror assembly. Filtered cooling vents on the rear cell let hot air to be expelled from behind the primary mirror.

The EdgeHD is an incredibly versatile instrument, with a 0.7x reducer available separately and Fastar/Hyperstar compatibility for super-fast imaging at f/2.

Every EdgeHD is tested in-house by Celestron to ensure its high optical performance and the surface quality of each optical surface.  

 

Optical design Aplanatic Schmidt-Cassegrain
Aperture 234.95 mm (9.25")
Focal length 2350 mm
Focal ratio f/10
Resolving power 0.49 arc seconds
Image circle 42 mm
Light gathering power 1127 times the human eye
Central obstruction diameter 85 mm (36% of aperture diameter)
Wavelength range 400 - 750 nm
Optical coatings StarBright XLT
Backfocus from rear flange 146.05 mm
Mount attachment CGE dovetail plate
Threads 3.28"-16
Tube length 559 mm
Tube weight 9.53 kg
Tube diameter 271.78 mm
SKU CE-91040-XLT

 

  

  • EdgeHD 925
  • CGE dovetail
  • 9 x 50 finderscope
  • 2" mirror diagonal
  • 23mm Luminos 2" wide-angle eyepiece

Customer Reviews

Be the first to write a review
0%
(0)
0%
(0)
0%
(0)
0%
(0)
0%
(0)
CELESTRON EDGEHD 925.

CELESTRON EDGEHD 925

$2,999.00 USD

Optical design

Aplanatic Schmidt-Cassegrain

Image circle

Focal ratio

f/10

Aperture

235 mm

Focal length

2350 mm

Optical thickness

Threads

Cooled

Colour or Mono

Pixel size

Sensor dimensions

Resolution

Sensor diagonal

Quantum efficiency

Read noise

Fullwell capacity

Bit depth

FPS

Camera backfocus

Filter size

Filter size

Bandpass (FWHM)

Bandpass (FWHM)

Glass thickness

Mount type

Payload capacity

Latitude range

Dovetail saddle

Slew speed

Encoders

Periodic error correction

Counterweight shaft

Azimuth adjustment range

Internal diameter

Illuminated diameter

Compatible telescope external diameter

Weight

9.53 kg

Length

Width

Height

View product