2460, 15 mm Plossl Eyepiece 1.25" . Comes Includes With Dual Speed 2'' Focuser. Image 2 shows the inside of the GSO RCT (left) compared to the inside of the GSO classical Cassegrain (right). In the winter, I set up a computer in my minivan to stay out of the elements. M57 is magnitude 8.1 while NGC5195 is magnitude 9.6. You can use an RCT for visual use, but with a 47% secondary obstruction by diameter, the views are not as great as in an 8-inch Newtonian or classical Cassegrain. Comparison Table Header Explained. My main imaging camera is an SBIG ST-2000XCM. A complete 2004 how-to guide, packed with advice on the most popular telescope in the world. Rs.2100, GSO 2 inch Mirror diagonal . The C-400 16" f/14 Classical Cassegrain is part of Takahashi's Observatory Series telescopes designed primarily for research and educational institutions. . Generous backfocus allowing the use of 2" accessories. . . The classic, 8-inch Schmidt-Cassegrain revolutionized amateur astronomy in the 1970s. Found inside – Page 46The result is a refractor with a much reduced secondary spectrum compared to one of classical design of the same ... Schmidt–Cassegrain and Maksutov–Cassegrain telescopes In the past couple of decades, the Schmidt–Cassegrain and its ... . . . I recently reviewed a Guan Sheng Optical (GSO) 8-inch classical Cassegrain telescope for Astronomy Technology Today. Rs. . Found inside – Page 46So too is the best-known telescope of them all – the Hubble Space Telescope. However, the famed 200-inch Hale reflector on Palomar Mountain in California is essentially a classical Newtonian/Cassegrain. (This telescope has actually ... Found inside – Page 60makes both telescopes and binoculars , including a well - supported series of Schmidt - Cassegrain design catadioptric telescopes . ... Parks offers a pair of 6 - inch reflectors ( $ 799 ) and an 8 - inch reflector ( $ 1,099 ) . Here in this video I have used these optical instruments :Meade LX200 Classic EMC 8 Inch Schmidt-Cassegrain Telescope. I purchased my 8-inch RCT (Image 1) from Astro-Tech solely for the purpose CCD imaging. Image 3 is the star cluster NGC884. . No competing Schmidt-Cassegrain Telescope can make those claims. . - Oakland, CA 94619 Chabot is the largest public telescope facility in the country, home for . . mount and clock drive. . 2280, Mobile Cell Phone Adapter . The resulting system has less coma and diffraction . . These claims tend to confuse the amateur astronomer into believing you must have 1/10 wave optics, when . I see a post where its alleged these scopes are only really 186mm! . Found inside – Page 313The oldest - established system which comes up for consideration is the classical Cassegrain . If the only object of the 72 - inch telescope were to act as a condenser for stellar spectroscopy , it would be hard to improve on this ... Additionally, this telescope can capture 8-inch telescope images with one single snap. . . The Unistellar eVscope2, which is the new version of the original eVscope, is a... Astrophotography gear, Reviews, Telescopes. Because I planned to do a lot of imaging with this telescope, I decided upfront to upgrade to a JMI EV-1 focuser, which I consider one of the top focusers on the market. 2100, GSO SuperView 15mm 1.25" Wide Angle Eyepiece . . . As seen in Image 2 and 6, I had to use all three of the supplied focuser extension rings to achieve focus with my CCD camera. Orion CC6 6" Classical Cassegrain Telescope. Subscribe To Our Newsletter. . STAR INSTRUMENTS guarantees a minimum of 1/4 wave front, 1/20 wave r.m.s. Found inside – Page 72The 6-inch Dobsonian is the classic beginner's telescope, capable of revealing terrific detail on the Moon and ... It can do this without being polar-aligned, once it has been 8-inch Schmidt-Cassegrain telescopes are strong contenders. Sign up with your email address to receive news and updates. As an example In the Meade line, the LX200 is an SCT and the ETX series is an MCT. Epsilon Bootis, Delta Cygni, the Iota Cass trio, and even the seeing-hampered Antares resolved nicely into concentrated pinpoints, only marred slightly by the unavoidable spider diffraction and secondary obstruction. We now take a look at the upcoming 8" OTA of the Classic Cassegrain design soon to be available in the ASC inventory. f8, 24 ft FL , . . / . Ritchey-Chrétien telescopes are a type of Cassegrain telescopes designed to eliminate coma. . Rs. . in the mid 1960s and are known for their fine optical and. . The Kohl Telescope is a 20-inch classical Cassegrain reflecting telescope that was built by DFM Engineering in Colorado. Found inside – Page 271-6 , 8 ] All of this photometry was performed with B , V , R , and I filters and reduced to the standard Johnson system ... which houses a 20 inch ( 51 cm ) aperture f : 10 Classical Cassegrain telescope on a massive German equatorial ... An 8 telescope, also known as an 8-inch telescope, allows the viewer to see astronomy with the touch of a button. This 6" f/12 Cassegrain from GSO is a modern take on the classical Cassegrain design. Unlike the average telescope, this one is compact and can be carried around and packed away more easily. The overall focal ratios are f/7 to f/9, much faster than classical Cassegrains. A very good overview about the use of 8 inch Schmidt-Cassegrain fork equatorial telescopes, set up and operation, by Celestron International (in Acrobat Reader ".pdf" format). #25 / 33. 4800, GSO SuperView 50mm 2" Wide Angle Eyepiece . And I don't believe A. Jaegers manufactured cassegrain mirrors. Rs. This article will feature a 12.5 inch Classical Cassegrain with parabolic primary and hyperbolic secondary Advantages and Disadvantages of the Cassegrain The advantage of the Cassegrain is that it allows for a long focus telescope in a relatively short tube. This works perfect for the RC8 flattening the field and reducing the focal ratio from f/8 to a faster f/6.4. Will so-called âsmartâ digital telescopes save us from light pollution? Also in the image is IC4278, a 17th magnitude elliptical galaxy. . The Maksutov-Cassegrain telescope has a 102mm aperture and a focal length of 1300mm. Ritchey-Chretien vs Classical Cassegrain. We have four difference versions and dimension to fits with difference refractor and Schmidt-Cassegrain telescopes. Based on a folded optics Schmidt-Cassegrain design, its distinctive blue optical tubes and black, heavy-duty forks have become something of an icon. In this article, I review the GSO 8-inch GSO Ritchey-Chrétien. Like the M57 image, star forming regions and dust lanes are captured in the image. . And to make it easier for you to get the most extensive news, articles and reviews that are only available in the magazine pages of Astronomy Technology Today, we are offering a 1 year magazine subscription for only $6! These claims tend to confuse the amateur astronomer into believing you must have 1/10 wave optics, when . . on all systems. . . and Ph.D. degrees from The Johns Hopkins University, both in planetary science. Rs.5700, ED 3X Barlow Lens GSO 1.25" . I recently reviewed a Guan Sheng Optical (GSO) 8-inch classical Cassegrain telescope for Astronomy Technology Today. Rs. 10-Inch Aperture. Meade's Advanced Coma-Free system also reduces astigmatism and eliminates diffractions spikes found in classical RC telescopes. Assuming high quality optics, the diameter of the point of light is determined by the telescope's focal length (longer focal lengths result in larger star diameters) and the sky's 'seeing' conditions (atmospheric dispersion spreads the point of light, making it larger). 24 inch classical Cassegrain (currently being restored) 8 inch Meade Schmidt Cassegrain . Found inside – Page 58This classical apochromat, corresponding to Zeiss-type B, not only possesses nearly ideal chromatic correction but is also ... Cemented three-lens apochromats of f 8 and faster (e.g., Starfire Triplet, APQ Fluorite of Zeiss) that can be ... A friend of Cave's, O. R. Norton, was invited over to see it and is quoted in the August 1994 issue of S&T: "I arrived at 265 Roswell Av and passed through the gate to the backyard - and into another world. . TS-Optics 8" f/12 Cassegrain telescope 203/2436 mm OTA. Found inside – Page 386The CTIO 0.9m is a classical Cassegrain . The 4 - meter telescopes both have doublet field - correctors . The USNO 0.2m ( 8 - inch ) astrograph has a 5 - element lens which is designed for a go flat field of view for photographic plates ... The second RCT was a 40-inch built in 1934 for the Naval Observatory and is currently at their Flagstaff Station. This Dobsonian telescope features a 10-inch aperture that is specially designed to collect more light from the sky. An 8 telescope, also known as an 8-inch telescope, allows the viewer to see astronomy with the touch of a button. The 76mm field is fully shielded and unvignetted. . Since the mid 20th century, a majority of large . The incoming light… The worlds most beloved telescope! 1560, Eyepiece Projection Camera Adapter . Maksutov-Cassegrain and Schmidt-Cassegrain are the most popular brands of composed telescopes, which are great for astrophotography, planetary and deep-sky viewing. In this article, I review the GSO 8-inch GSO RitcheyâChrétien. The classical Cassegrain would be the better choice for visual use, while the RitcheyâChrétien is the better instrument for astronomical imaging. Direct comparison with a high-quality 6-inch ED refractor at magnifications ranging from 145x to 252x showed nearly identical detail on Jupiter. I would defer to the GSO 8-inch classical Cassegrain telescope for visual use. However, for CCD imaging, the GSO 8-inch RitcheyâChrétien is an ideal mid-sized instrument for CCD imaging. Optically, the telescope is excellent. 3000, 2 inch T-2 Camera Adapter . The 8" LX90 has an 8" diameter f/10 ACF optical system (focal length 2000mm) and Ultra-High Transmission Coatings (UHTC) for maximum image brightness and . Also visible is the 15th magnitude spiral galaxy IC1296 located 4 arcminutes northwest of M57. The scope was an immediate success, offering high quality optics in a compact package that was reasonably affordable. Found inside – Page 164Ryan Caputo in his backyard with his telescope, a 6-inch classical Cassegrain and ZWO ASI 1600 mm camera riding on an iOptron CEM60 mount. This system specializes in deep sky astrophotography. Ryan Caputo. Indra Firdaus is the current ... The f/12, 2436mm EFL specifications seem a good fit to again fill that role. The Dall-Kirkham Cassegrain with its F/20 focal ratio and smaller central obstruction is perhaps the ultimate high magnification visual planetary telescope. He is the president of Methodist College in Peoria, Illinois. He has played a key role in several observatory projects including the Powell Observatory in Louisburg, KS, which houses a 30-inch (0.75-m) Newtonian; the Naval Academy observatory with an 8-inch (0.20-m) Alvin Clark refractor; and he built the Coast Guard Academy Astronomical Observatory in Stonington, CT, which houses a 20-inch (0.51-m) Ritchey Chrétien Cassegrain. . . Found inside – Page 39It will outperform Schmidt-Cassegrains and Maksutov-Cassegrains of 8-inches aperture, and on occasions, it has provided better images of Mars obtained with my own 16.5-inch DallKirkham Cassegrain. A major feature of this book is the way it compares not only different classes of refractor, but also telescopes of each class that are sold by various commercial manufacturers. Because of its slow focal ratio, the Classical Cassegrain in not usually employed for deep-sky CCD imaging, although it is possible to design a Cassegrain with a faster focal ratio (f/8 or so). He has been a professor of physics astronomy at several colleges and universities. Found inside – Page 26The collimation of Newtonian and classical Cassegrain telescopes is within the abilities of anyone . ... The typical central obstruction of an 8inch Schmidt - Cassegrain ( S - C ; also " SCT " ) from either major manufacturer is 35 ... My first experience with an RCT was when I ordered a 20-inch RCT for the Coast Guard Academyâs Astronomical Observatory in the year 2001. Because the C-400 employs the Classical Cassegrainian configuration with a . These two upgrades combined cost almost as much as the OTA! Likewise, Saturn presented an impressively sharp and pleasing image, the Cassini division wrapping the full circumference of the planet, and subtle belt and zone detail being just a bit less visible than with the 6-inch refractor. Experience our celestron cassegrain telescopes, including our wonderful nexstar evolution 8 hd with starsense & more available today at ontario telescope! One of the main reasons why I bought the Celestron Edge HD 8″ (800) telescope is that it provides a long focal length (2030mm) and a big aperture (203mm / 8″) at a relatively affordable price ($1349). . The 125 mm field is fully shielded and unvignetted. Rs 7500, GSO 2 inch 99% Quartz Dielectric mirro Diagonal CNC . This item: Orion CC8 8" f/12 Classical Cassegrain Telescope $999.99. He achieves this through a series of worked examples and short project walk-throughs, detailing the equipment needed – starting with just a DSLR (digital single lens reflex) camera and tripod, and increasing in complexity as the book ... 2550, 20 mm Plossl Eyepiece 1.25" . mechanical properties. . A great place for starting with your first telescope is a small refractor. Order it now. The most popular size sold is the 8-inch model, which starts at $895 with a steel tube. The author's cat is reading the fine print on the bottom of the dovetail plate. MCRF086: * 86mm flange diameter (fits tube ID of 86mm). There is also a third variation called a Schmidt Cassegrain, which has become popular throughout the years with its combined system of refractor and reflector lens. on all systems. Found inside – Page 37SchmidtThe Schmidt - Cassegrain Cassegrain telescopes are considerably less telescope , plenty of prone to these types ... The optical tube assembly A refractor can be a little cumbersome to of a typical 20 cm ( 8 - inch ) f / 10 SCT is ... I should note this image was taken prime focus without the 0.8x focal reducer/field flattener. The 6" stationary primary mirror - made from thermally stable quartz -- won't exhibit image shift or mirror flop like in a typical . Unlike classical Cassegrains, RCTs do not have parabolic primary mirrors, but hyperbolic mirrors. This scope does not include a mount. Manufacturers & Suppliers of Astronomical Telescopes in India, 8" F/12 M-CRF Cassegrain Telescope OTA (Optical Tube Assembly), The following items are FREE with the telescope listed above. STAR INSTRUMENTS continues to be concerned with the false advertising claims being made by amateur optical suppliers who claim 1/10 to 1/20 wave optics. . 3000, GSO SuperView 20mm 1.15" Wide Angle Eyepiece . Rs 5700, GSO 2 inch 99% Dielectric mirror Diagonal CNC . Brighter image due to 99% dielectric coating on primary and secondary mirror. Elevation about 1400' 10000 Skyline Blvd. This aperture is enough to look at deep sky objects, enough focal length to look at the moon and planets, and - when properly equipped - can do . STAR INSTRUMENTS continues to be concerned with the false advertising claims being made by amateur optical suppliers who claim 1/10 to 1/20 wave optics. This 30-minute exposure easily picked up the planetary nebulaâs 14.8 magnitude central star. The advantages of GSO Cassegrain Telescopes in summary: Cassegrain optics with parabolic primary and hyperbolic secondary mirror, Classical Cassegrain telescope with 8” aperture and focal ratio of f/12, ideal for visual observation and imaging of the Moon, planets, double stars, planetary nebulae, and other compact celestial objects, Folded optical design packs a focal length of 2436mm into an optical tube only 535mm long, No glass corrector plate means no chromatic aberration and fast temperature equalization and resistance to dew formation, Lightweight tube and optics for a total weight of just 20lbs, ideally matched to many mid-capacity alt-az and equatorial mounts, Dual-speed 2” Crayford focuser with 1.25” adapters with non-marring compression rings, Includes Losmandy and Vixen-style dovetail rails, shoe for finder scope, and dust cap. Cassegrain Reflectors and Cassegrain Catedioptrics work in different ways, the former utilizes your classic Reflecting technology and mechanisms. Or, for an even better deal, we are offering 2 years for only $9. Download the publication Celestron C-8 Telescope, the complete instruction manual which we include with the Celestar 8 and the Celestar 8 Deluxe telescopes. . CCT-32 | Classical Cassegrain 32" Telescope. The basic 8-inch RCT comes with a steel tube. Linear Bearing Prevent Focuser Flexure While Focusing And Locking, Our Classical Cassegrain Telescope Are Built With highest Standard Baffled Tube To Provide Maximum Contrast And Prevent Stray Light From Disturbing Viewing Or Imaging. Found inside – Page 30The secondary is 8 - inches in diameter , 1inch thick , with an overall effective f - ratio of 8.0 . The configuration and figure of the mirrors are classical Cassegrain . ii ) Mount a case can Both equatorial and non - equatorial ... . Found inside – Page 578... AND REDUCTIONS The speckle package was tested using a 0.2 - m ( 8 - inch ) f / 10 Schmidt - Cassegrain telescope ... The package was also tested using the 0.4 - m ( 16 - inch ) f / 16 classical Cassegrain at HLCO on 31 Mar , 1992. American astronomer George Willis Ritchey and French astronomer Henri Chrétien invented the RitcheyâChrétien telescope (RCT) in the early 20th Century. Ritchey actual built the first RCT in 1927. No shifting, because the primary mirror is fixated, High-quality 2" Crayford focuser with micro-gear reduction and compression rings for 2" and 1.25" accessories. Back then only three companies offered 20-inch RCTs: Parallax Instruments, PlaneWave Instruments, and RC Optical Instruments. The image even captured the tiny edge-on spiral galaxy IC4277, magnitude 15.6. Post-processed to include all the planets in one frame, this is the power of merely an 8 inch aperture size telescope, the Celestron NexStar 8 SE Computerized Cassegrain Telescope.The better you get at astrophotography, the better your images William Herschel's 40-foot telescope, also known as the Great Forty-Foot telescope, was a reflecting . STANDARD OPTICS: • Our typical 0.8M Classical Cassegrain has an F/3 primary mirror with an effective focal ratio between F/8 and F/18. Rs. . This is the perfect book for amateur astronomers who are about to invest in a new Schmidt-Cassegrain or Maksutov telescope, or for those who already have one and want to get the most out of it. Also available for viewing, located in the roll-off roof area of the observatory, is a mounted 12-inch Schmidt-Cassegrain reflector telescope. It is also easy to attach this OTA to any number of mounts using the Vixen-style dovetail. It allows use of 2" accessories, and a 1.25" adapter is included for use of 1.25" eyepieces and accessories. The Meade LX90ACF 8in Telescope with UHTC 0810-90-03 can do more than track satellites. 40mm Plossl Eyepiece 1.25" . Found inside – Page 140The largest telescope I ever had was an 8-inch Cassegrain. But it was near a city, where a night sky hindered deep sky observation. There was an advantage to my waiting for the mirror: I completely reworked the Springfield mounting, ... With this correction it is 1300mm. 2100, 9 mm Plossl Eyepiece 1.25" . With a focal length of 2436mm, it's ideal for crisp and razor-sharp visual observation and imaging. The tightness of stellar points is superior to what the average SCT can produce. I have for sale a Tinsley Labs 8-inch Classical Cassegrain. Found inside – Page 64... mm ( 2.4 inches ) 90 mm ( 3.5 inches ) 12.5 cm ( 5 inches ) 15 cm ( 6 inches ) 20 cm ( 8 inches ) 25 cm ( 10 inches ) ... 5.5 Types of telescopes Refractor Newtonian ( Classical ) Cassegrain 64 Telescope optics 5.5 Types of telescopes ... > images because of sheer size. "poor man's cassegrain" (spherical 2ndary cheaper) 1 2 2 1 (m2 ) + much easier to build and test . Rs. The image captures the galaxyâs bright core and the bright oval ring surrounding the inner region of the galaxy. Found inside – Page 44Ritchey–Chrétien telescopes in apertures from 10 to 16 inches and prices ranging from $6,000 to over $16,000.* These premium telescopes are ... And visually, image quality is noticeably improved over that of a classical Cassegrain. 1650, Carry Bag EXOS-II Stand . 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.
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