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Ritchey Chretien astrograph with 254 mm aperture with corrector and fast focal ratio of f/6.4 for astrophotography with sensors up to full frame format
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Teleskop-Service offers an exciting instrument for the dedicated astrophotographer with this Ritchey-Chrétien telescope. The telescope is built by GSO for TS to our specifications. We select very good optics for this series and use a better focuser. A core part of the astrograph is the full frame format corrector, which is integrated in the focuser. The corrector is specially designed for RC telescopes and offers a very good field correction for sensors up to full frame format. This provides you with a fully equipped telescope for high resolution astrophotography, which does not need to shy away from the comparison to much more expensive instruments.
The mechanics of these modern telescopes provide the basis for successful astrophotography. Primary and secondary mirrors are stably mounted and hold the collimation even during telescope slewing. The supporting elements are made of carbon, which reduces the dead weight and improves the focus stability, since carbon does not react to temperature changes as strongly as metal. The focuser can be tilted independently of the primary mirror, a hallmark of high-quality larger RC telescopes. This allows you to get the stars perfectly round even in the last corner.
The hyperbolic primary mirror and secondary mirror are made of quartz glass and have a 99% coating. This makes the image brighter and rich in contrast. Each RC is tested before it is converted to a photo RC in our workshop. The primary focal ratio of the RC is f/8. The RC corrector and reducer improve the focal ratio to f/6.4. The 3-element corrector used is designed specifically for RC telescopes and is not simply a compressor. The result is significantly sharper stars across the entire field of view.
The photo-optimized RC already comes with the right adaption for your camera. Of course, the cameras are screwed and not clamped.
Although the RC is mainly intended for photographers, observation is of course also possible. You can simply unscrew the insert with the corrector from the focuser and replace it with a 2" insert. The conversion takes only a few minutes and you have a classic RC telescope for observation or lunar and planetary photography. The insert to 2" and the reducer to 1.25" are of course included.
Data sheet
j'ai commandé ce tube voulant un telescope compact et stable sur la collimation. Très bonne qualité de fabrication, miroir GSO mais tres bonne qualité avec test sur banc optique à l'appui: Analyseur de front d'onde Shack-Hartmann: Lambda/22 RMS et Lambda/4.5 PTV au laser vert longueur d'onde 543 nm. Focuser de très bonne qualité bien meilleur que la version f8, et réducteur de très bonne qualité avec correction très bonne pour un capteur APCS. Je n'ai pas pu tester sur un full frame. Réglage du Tilt intégré, pas de besoin de bague spécifique de réglage du tilt, ventilation du primaire pour la mise en température. nombreuse bagues allonges et adaptateurs fournis. Merci beaucoup de m'avoir fait franchir le pas!!! les images qu'il donne sont magnifiques. Le bémol commun à tous les RC: collimation délicate et nécessitant un bon laser et un microscope de Takahashi si vous n'avez pas la possibilité de le faire collimater sur banc optique. Pensez à bien mettre la bague qui diaphragme le baffle (fournie) ou l'extension de déflecteur (ce que j'ai fait et vendu par Univers Astro) pour éviter les lumières parasite d'entrer (sans cette extension, il y a un halo lumineux sur le champ imagé, comme un flat inversé). Pensez également à prévoir une jupe.
Reference: KE096
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Reference: TSCOLLIT
Brand: TSOptics
Ritchey Chretien astrograph with 254 mm aperture with corrector and fast focal ratio of f/6.4 for astrophotography with sensors up to full frame format
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