Celestron CGX-L RASA 11 Telescope (SKU: 12074) GOTO telescopes opinie

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Taking impressive deep-sky images is easier than ever with Celestron's Rowe-Ackermann Schmidt Astrograph (RASA) V2. This very bright (f/2.2), wide-angle system allows for much shorter exposure times than traditional f/10 telescopes without sacrificing resolution.

At very short exposure times, tracking errors of the equatorial mount will be small. The short focal length also reduces the requirements for tracking accuracy. In many cases, autoguiding will not be required. The RASA 11 V2 offers an accurate and sharp image in a field of 43.3 mm - this is the diagonal of the sensor matrix for a full frame 24x36 mm. The image quality up to 52 mm diagonal will still be very good. The combination of an accurate and large imaging diameter with a focal length of only 620 mm gives an instrument suitable for wide-angle photography, creating huge mosaics of the night sky and even searching for comets.

Optical efficiency

The RASA 11 V2 features 4-element rare earth glass optics. This allows for a coma-free and field-curvature-free image with faithful color reproduction. The optical quality and spot size across the entire image field circle are unprecedented for an astrograph in this price range. This optical design also ensures minimal vignetting.

Advanced Features

The RASA 11 V2 utilizes the new Ultra-Stable Focus System (USFS). The heart of this system is a precision linear ball bearing. The bearing is used to minimize focus shift (the unwanted lateral movement of the primary mirror during focusing that causes the image to shift) and mirror flop (the slight shifting of the primary mirror when the telescope is pointed at different directions at the sky). The USFS is also compatible with the optional Celestron Focus Motor (#94155-A). An integrated 12V DC MagLev fan shortens the cool-down time of the primary mirror and ensures optimal airflow through the optical tube.

Every element of the RASA 11 V2 is optimized for maximum performance with DSLR and astronomical cameras. The CGE dovetail rail on top of the optical tube provides connection for optional accessories such as a guide scope.

Installation

This is a development of the Celestron CGX mount - the successor to the proven Celestron CGEM mount. Increased load capacity to as much as 34 kg with a head weight of 21 kg, a powerful tripod with 70 mm diameter stainless steel legs, a right ascension axis worm with a diameter of as much as 144 mm, a 270 mm long Vixen / Losmandy standard saddle, or a massive counterweight rod with a diameter of 31.5 mm are impressive. The standard equipment includes a drive with a gear ratio using a belt, optical and mechanical limiters, start position markers and as many as 4 AUX ports.

Technical parameters

• telescope optical system: Rowe-Ackermann Schmidt Astrograph
• mounting type: parallactic
• aperture: 279 mm
• focal length: 620 mm
• aperture: f/2.2
• star range: 14.8 magnitude
• maximum usable magnification: 558 x
• maximum resolving power (Rayleigh): 0.51"
• maximum resolving power (Dawes): 0.42"
• aggregate capacity: 1589x
• tube weight: 19.5 kg
• assembly weight: 44.8 kg
• counterweights: 2 x 10 kg
• total weight: 84 kg
• tube length: 838 mm
• tube diameter: 330 mm
• tripod type: steel 2.75"
• stand height: 152 - 196 cm
• assembly control: NexStar Go-To
• Secondary mirror diameter: 114 mm
• central obstruction: 41%
• coatings: StarBright XLT