Primary focal ratio of 4. STAR INSTRUMENTS guarantees a minimum of 1/4 wave front, 1/20 wave r.m.s. Includes 2" Feather Touch or 2.7" AP Focuser (Specify), 8X50 finder, standard tube rings, tube weight counterbar assembly and slewing handles. The OTA was replaced with an orange-tube Celestron 14″ Schmidt-Cassegrain telescope on the same extremely-beefy Ealing mount, and it all works reasonably well. £2,999.00 Add … Classical two-mirror arrangements are Gregorian - the very first reflective telescope design, conceived by James Gregory in 1663 - and Cassegrain (FIG. And the Baader RT Steeltrack makes a nice upgrade for the 8” Cassegrain. Measurements are in inches. Or, if you're looking for more aperture and resolution, we also have a beautiful new 10" GSO classical Cassegrain OTA that's fully tested and ready to ship. Location: Derby. It comes in a soft travel case with a 25mm Sirius Plossl 1.25″ eyepiece, a 45-degree correct-image diagonal, and a 6×26 correct-image Finderscope. The components from the mechanics to the software, and also the optics fulfil the highest quality standards. We describe the required modifications and the performance of both implementations of TSpec4. It's a classical Cassegrain with a very sturdy and precise truss tube. StellaLyra 10" f/12 M-LRC Classical Cassegrain Carbon Truss Telescope OTA. Shop by department, purchase cars, fashion apparel, collectibles, sporting goods, cameras, baby items, and everything else on eBay, the world's online marketplace The Dall – Kirkham, for example, is a non classical Cassegrain in which the secondary is … These telescopes are a good alternative to Schmidt Cassegrains with some advantages. The Classical Cassegrain offers a very long focal length in a relatively compact tube. An updated data pipeline provides reduced spectra from the instrument. There is usually from a paraboloid primary mirror and a hyperbolic secondary mirror. First conceived in 1672, the classical Cassegrain telescope uses a parabolic primary mirror and a hyperbolic secondary mirror to fold … Credit: Larry Carlino. The classical Cassegrain telescope optical system uses a parabolic primary mirror and a hyperbolic secondary. Cassegrains are telescopes for observation but also for photography of the moon and planets. Classical Cassegrain - reflecting telescopes. The long focal length classical … The “classical Cassegrain” catoptric telescope. Serious inquiries only. Clear Aperture 12.5 Focal Length 187.5 Minimum Secondary Diameter 3.237 Geometric Focal Ratio 15 … Enters the summer of 2018: Teleskop-Express announces the arrival of a new telescope type in their program: a 6 and 8 Classical Cassegrain with a parabolic main mirror and a hyperbolic secondary. The large primary mirror reflects the image onto the smaller secondary mirror. The performance of this telescope can be considered to be equal to or better than that of comparable size Schmidt-Cassegrain designs. This telescope comes standard … The classical Cassegrain would be the better choice for visual use, while the Ritchey–Chrétien is the better instrument for astronomical imaging. In conclusion, the GSO eight-inch classical Cassegrain telescope is an excellent all-around telescope for visual use. A relatively large central obstruction necessitates the most precise optics for superior resolution. Classical Cassegrain: Parabolic Primary and hyperbolic secondary General Observing: Effective focal ratio of 15. A Ritchey–Chrétien telescope (RCT or simply RC) is a specialized variant of the Cassegrain telescope that has a hyperbolic primary mirror and a hyperbolic secondary mirror designed to eliminate off-axis optical errors ().The RCT has a wider field of view free of optical errors compared to a more traditional reflecting telescope configuration. APM-Telescopes presents a new telescope in our APM Professional range. VAT) Altair 6" F4 Photo Newtonian Telescope From: £389.00 £324.17 (ex. Focal Reducer for viewing/imaging DSO with f/12 Classical Cassegrain Buying Advice I'm considering a GSO 8" f/12 Classical Cassegrain which should give me great lunar and planetary views, but I would also like to view DSO with it as well. Long focal length of 1836mm (f/12) "folded" into an optical tube just 20.5" long - so … Because Cassegrain telescopes use two mirrors to … In these systems, the primary and secondary mirrors have figures different from the catadioptric scopes, and there is no corrector lens required in the classical Cassegrain reflecting design. Share. He is therefore tempted to use the Dall-Kirkham design, in which the secondary is a convex sphere while the primary is a concave ellipse. No meniscus or lens that could fog, only two reflections of each 99%. The classical Cassegrain design uses a parabolic primary mirror, as in a standard Newtonian design. ♦ Open system, thus less dew problems and faster cooling; The parabolic primary … Classical Cassegrain telescope with 10” aperture and focal ratio of f/12, ideal for visual observation and imaging of the Moon, planets, double stars, planetary nebulae, and other … Recently, I was asked to check out the optics on this original classical Cassegrain telescope, which is supposed to have a parabolic primary and a hyperbolic secondary. For deep observations, the camera is operated with 4 × 4 pixel binning, producing (raw) images in 257 × 256 pixel format, including a … The (curved) field of the telescope is limited by coma since the telescope does not satisfy the Abbe sine condition. Classical Cassegrain and Dall-Kirkham Cassegrain (Includes Tube Mounting Rings) Model PI250C 10" F/15 Classical Cassegrain : $5,900: Model PI250DK, 10" F/20 Dall-Kirkham Cassegrain Light enters the telescope from the left. The original postulation for the Cassegrain telescope was to have a primary parabolic mirror focusing its rays onto a convex hyperbolic secondary mirror; the classical Cassegrain. Telescopes made of such products require frequent refocusing during the night as the temperature changes. The Takahashi collimating scope is a 6 x 18mm telescope designed for use on refractor, Ritchey-Chretien and classical Cassegrain telescopes and also used on the Takahashi CN-212, … A Modern Take on a Classic Telescope Design. Contrary to popular beliefs, Cassegrain optics if designed and executed properly, can deliver pinpoint stars (no coma) in both 1.25″ and 2″ eyepieces. That extra variable, of the field lens power, plus the two conic surfaces on the The 30 cm Classical Cassegrain is the largest operational telescope on the observation platform. Classical Cassegrain / 1.5-m telescope: Cassegrain F18, 1.0-m telescope: Cassegrain ＆ Nasmyth＆ Coude F12: Alt-Azimuth Mount: 1.3-m telescope Institute of Space and Astronautical Science(ISAS),JAXA. Optical aberrations in amateur telescopes. The Argunov-Cassegrain telescope is another modified type of the Cassegrain telescope. US $680.00+$45.53 shipping. Joel Short - RC 250mm F/8. It is known as Dall-Kirkham and, although with stronger coma than its classical counterparts, its mirrors are easier to make, and its miscollimation sensitivity is considerably lower than in either classical or aplanatic Cassegrain, which makes it a viable practical alternative. It 's a Classical Cassegrain f/8 focus to operation at a Classical Cassegrain < /a > presents... 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