To use all the features on this website,
JavaScript must be enabled in your browser.

Celestron C9.25 SC XLT telescope with 235 mm aperture - optical tube assembly

Name: Celestron C9.25 SC XLT telescope with 235 mm aperture - optical tube assembly
Brand: Celestron
SKU: C9OTA
Price: 2145 EUR
Rating: 4.6667 (3 reviews)

The C9 OTA Schmidt-Cassegrain with 235 mm aperture and f/10 is still portable and offers a large aperture for observation and astrophotography.

Aperture 235 mm / 9.25" - focal length 2350 mm / focal ratio f/10

Vixen/EQ5 style dovetail bar, suitable for EQ5, HEQ5, Advanced VX mounts and similar

The telescope is already suitable for FastStar (HyperStar - compatible)

No focus problems due to internal focusing of the primary mirror - accessories such as correctors for astrophotography or binoviewers can be connected directly

With a weight of 9.4 kg and a transport length of only 58 cm, the C9 is still carried by compact mounts such as the H-EQ5 or the Advanced VX.

Tube colour dark gray

Manufacturer: Celestron

Product number: C9OTA

EUR 2.145,00

incl. 19 % VAT (DE)

The VAT indicated refers to that applicable in Germany. After logging in, the VAT amount is adjusted to the applicable VAT of the stored delivery country. Therefore, the final price may vary accordingly.

excl. 15.95 € shipping costs (DE)

Please log in to calculate shipping costs to your country.

more details to the shipping costs ...

rating: 4.6 of 5

Roll over image to zoom in or klick it. The appropriate zoom factor ist adjustable with the mouse wheel.

Celestron C9.25 SC XLT telescope with 235 mm aperture - optical tube assembly

The C9 OTA Schmidt-Cassegrain with 235 mm aperture and f/10 is still portable and offers a large aperture for observation and astrophotography.

Aperture 235 mm / 9.25" - focal length 2350 mm / focal ratio f/10

Vixen/EQ5 style dovetail bar, suitable for EQ5, HEQ5, Advanced VX mounts and similar

The telescope is already suitable for FastStar (HyperStar - compatible)

No focus problems due to internal focusing of the primary mirror - accessories such as correctors for astrophotography or binoviewers can be connected directly

With a weight of 9.4 kg and a transport length of only 58 cm, the C9 is still carried by compact mounts such as the H-EQ5 or the Advanced VX.

Tube colour dark gray

Details..
Technical data..
In the box..
Reviews..

Celestron C 9 1/4 Schmidt-Cassegrain - optical tube assembly

The C9.25 is more than just an interstage between the C8 and the C11. Compared with other Schmidt-Cassegrain systems, it offers more contrast and image definition thus making this telescope interesting especially for lunar and planetary observation. Celestron has designed this model with the those astronomers in mind who know the advantages of bigger apertures but who also like the sharpness and contrast close to a Maksutov-Cassegrain system.

Celestron achieves this by a completely new calculation of the optics. The C9.25 has approximately the length of the C11. Primary and secondary mirror do not have such extreme focal ratio and moderate radii. At the same high manufacturing accuracy, a better imaging quality is achieved. Of course, all Celestron C 9.25" are retouched by hand. The C9.25 is equally suitable for observation and astrophotography. Thanks to its compact design and weight of less than 10 kg, the telescope can also be used for mobile applications.

Astrophotographic results obtained with this telescope on Astrobin
Here you can find some astrophotographs made with this telescope model: Link to Astrobin

Application areas of the Celestron C9.25 SC telescope:

Deep-sky observations ... The optics offer maximum contrast and a large aperture. This allows faint nebulae, galaxies and star clusters to be observed well. With suitable seeing, double stars can be separated up to the theoretical resolution.

Lunar and planetary observation ... One of the core competencies of this telescope. With its modified optics, the C9.25 bridges the gap to the significantly more expensive Maksutov-Cassegrains and SC telescopes. The larger aperture makes the C9.25 a planetary specialist.

Astrophotography ... Lunar and planetary photography as well as deep-sky photography are possible with the C9.25. We have suitable correctors in our range. Of course, the telescope is also FastStar compatible. This allows you to convert the telescope into a fast f/2 Schmidt camera for modern astro cameras. Or you can use the corrector from Starizona, which brings the telescope to a fast f/6.3 with full illumination and correction up to APS-C format.

The advantages of the Celestron Schmidt-Cassegrain telescopes:

Short construction ... Through the special optical construction, the telescope is very short, thus the SCT can still be held by portable and economically priced mounts.

No focus problems ... Focusing is done by shifting the primary mirror. For this reason, you can attach almost all accessories, like binoviewers or corrector system for astrophotography.

Very bright image through XLT coating ... Through this multi-layered coating, optics from Celestron have an outstanding high light transmission. In the especially important spectral range around 500 nm, up to 10% more light is delivered at the eyepiece. At this wavelength, the human eye is extra sensitive.

High collimation stability ... The tube is short and compact and offers very high rigidity. As a result, the C9.25 also retains its collimation during transportation.

Aperture:	235 mm
Focal length:	2350 mm
Focal ratio:	f/10
Optics:	Schmidt-Cassegrain optics with XLT coating
Maximum useful magnification:	approx. 500x
Limiting visual magnitude:	14.5mag
Resolution:	0.52"
Diametral central obstruction:	34%
Fastar compatible:	yes
Tube length:	58 cm
Tube diameter:	265 mm
Weight:	approx. 9.4 kg

C9.25 optical tube assembly

6x30 finder

Visual back with SC thread and reducer to 1.25"

1.25" Star diagonal prism

25 mm Plössl eyepiece

Dovetail bar Losmandy style included

Astrophotographic results obtained with this telescope on Astrobin

Here you can find some astrophotographs made with this telescope model: Link to Astrobin

Image results of our customer Lothar Scherp

Object: Lunar crater Gassendi (image detail)
Telescope: C9.25 (from set C9NEQ6Goto)
Barlow lens: TS-Optics TSB251 for extension of focal length from 2350 mm to 5875 mm (factor 2.5x)
Camera: Canon EOS 80D
Sensitivity: 200 ASA
Exposure: 1/25 s
Filter: none
Mount: Skywatcher EQ6 Pro (from set C9NEQ6Goto)
Guiding: none
Note: The image crop acts like a magnification and shows all the details that can be reached, but appears blurry as a result.

Object: M51
Telescope: C9.25 (from set C9NEQ6Goto)
Reducer/corrector: TSRed6.3 with increase of focal ratio from 1/10 to 1/6.3
Camera: Canon EOS 80D
Sensitivity: 1000 ASA
Exposure: 26x 60 s
Filter: none
Mount: Skywatcher EQ6 Pro (from set C9NEQ6Goto)
Guiding: none

Object: M13
Telescope: C9.25 (from set C9NEQ6Goto)
Reducer/corrector: TSRed6.3 with increase of focal ratio from 1/10 to 1/6.3
Camera: Canon EOS 80D
Sensitivity: 640 ASA
Exposure: 34x 45 s
Filter: none
Mount: Skywatcher EQ6 Pro (from set C9NEQ6Goto)
Guiding: none

Many thanks to Lothar Scherp for these very informative photos!

Recommended accessories

Accessories for mounts

CE820843