+1 for considering your usual seeing conditions as the most important factor. When the largest telescope (Mount Wilson, from 1917-1949) had an aperture of 100" and the new Hale Telescope at Palomar doubled that aperture to 200", this feat of engineering and science was hailed as an unprecedented accomplishment that would change what we thought we knew about the Universe; and in many ways it did! 605-14002 Manuf. Lambo vs. McClaren F1 sort of issue. I also realise the 180/2700 Maksutov Casserain has a much narrower filed of view, so thinking this might also help in larger magnification. Powered by Invision Community. $109.99 $ 109. This may not be obvious at first. The Schmidt Cassegrain telescope combines the best of the refractor and reflector telescopes by using both lenses and mirrors in a compound system. Found inside – Page 10The Maksutov-Cassegrains manufactured in England by Orion Optics (their OMC line) are open-tube instruments with a ... substituting a spherical secondary for the hyperbolic figure of the classical Cassegrain design, and compensating ... I'm going to do a side-by-side comparison viewing of the planets when we get some clear sky. I norm just buy eq mounts I like the eq4 to eq5 it holds a decent amount size scope reflectors to reflectors to scts. Would be an interesting side by side session between these two scopes viewing Jupiter, Saturn and Mars. https://www.instructables.com/id/Equatorial-Platform-for-the-North/. It is also virtually collimation-free, unlike newtonians! Found inside – Page 168R Ro Ro Figure 1.8-27 Cassegrain - Maksutov system showing ... thickness 10.0 , radius Ra - 152.8 , Ro - 158.6 , n = 1.5163 , v = 64.1 ; meniscus - mirror distance 539.1 ; f - stop number f / 4 . over and the eyepiece be changed ? A good deal of these Newtonian optical tube assemblies were long, bulky, and heavy, which required large, heavy, and bulky mounts to allow them to track the apparent movement of the sky. but...I have never seen any 8in reflector show a better image than the TEC Mak for sharpness...so it’s unfair trying to compare the 2. Found inside – Page 3656.6.3 Bouwers - Maksutov ... 6.8.7 Classical Cassegrain and Gregorian Telescopes 6.8.8 Aplanatic Cassegrain and Gregorian Telescopes 6.8.9 Afocal Telescope 8.10 Couder Anastigmatic Telescopes 6.8.11 Schwarzschild Telescope . Does your seeing support a larger scope most nights? The GMT, although ground-based, is predicted to have a resolving power 10 times greater than the Hubble Space Telescope. High-resolution imaging and visual performance in a . I guess I could have just got 1 and just use each ota on it BUT I like to have a mount for each scope I own. (180 X). so I manilly used it for low to med to med high powers BUT not very high powers or the item would leave the ep fov. Sign up for a new account in our community. Are you unhappy with your 8"? Other reflector designs, e.g. Testing Planewave Instruments' 0.66x Focal Reducer. Maksutov-Cassegrain Telescope for Adults Kids Astronomy Beginners, Sarblue Mak60 Catadioptric Compound Telescope 750x60mm, Compact Portable Travel Telescope, with Tabletop Tripod Phone Adapter 318. By The telescopes are made in open truss construction style with CFK-tubes and . The figures presented below have been made by computer and are very typical of what can be seen in a Schmidt-Cassegrain, a classical or Dall-Kirkham Cassegrain, or a Newtonian (dominant coma). The mount can also be attached to a photo tripod. Well I've got a couple of dobs it is useful for, and it can also be used with a tripod and refractor or even for long exposures with a DSLR and widefield lens. No competing Schmidt-Cassegrain Telescope can make those claims. Found inside – Page 8-37... Berks RG7 4PA 39-700-777 tek-uk.com Telescope Exchange (custom Maksutov— ans; apertures to 16 inches) ging Pines Road ... Jewtonians $500—$3000 $1250—$ l 3,000 of equatorial reflector (i.e. classical Cassegrain) $20,000—$75,000 + up ... . SCT primary mirrors are often supported entirely on a metal tube which also acts as a stray light baffle. How would you guys answer to the 10” being scraped for a 12” with the same CO as the 8” Mak. Fluctuations in the ambient temperature can cause mirror movement as well. This period was before the availability of the now popular Schmidt-Cassegrain and Maksutov-Cassegrain telescopes. ok I see where you coming from, that looks similar to the az4. The three pusher screws normally have coarse machine threads, which can result in one being somewhat loose. Those itty bitty little TV things? Found inside – Page 229Maksutov - Cassegrain telescopes are now commonplace and are available from the major telescope manufacturers around the ... they are usually of a classical Maksutov design , with the corrector lens at the front of the telescope tube . In regards to viewing planets, I currently have a 16 inch Dobsonian (400p) and i was interested to know how it would perform against the Skywatcher 180/2700 Maksutov Casserain. Eyepieces used with a focal reducer yield lower-power views. Also being long focal length cheaper eyepieces perforn well. I do use eyepieces with wide fields of view though, which helps. 2021-2022 Catalog Manoa Catalog Office 2500 Campus Road, Hawaii Hall 121 Focusing these scopes is performed by sliding that primary mirror forward or backward along the baffle tube. It's easy! The image was bright, sharp and so much deatil. A telescope whose optical performance is not limited only by the physics of diffraction implies that its performance is limited by other factors greater than diffraction effects! Among the catadioptrics, the Maksutov Cassegrain has justifiably earned a solid reputation as an excellent high resolution telescope. The 6" stationary primary mirror - made from thermally stable quartz -- won't exhibit image shift or mirror flop like in a typical . I used one on a Skytee II alt az mount and it was just so quick to set up. On the other hand, it's not just catadioptric telescope designs that suffer this fate – bigger apertures always increase weight. We also desire to see brighter images of objects, including planets, if possible. Found inside – Page 20Classical Cassegrain , parabolic primary mirror and hyperbolic secondary . 4. ... Maksutov - Gregory Cassegrain , very slightly aspheric primary mirror , spherical meniscus corrector shell ... The nine compared telescope systems . The Tec is an awesome scope and I know if I sell it the chances of ever finding another one for sale would probably not happen or I would miss out on it to someone scooping it up a lot quicker than me. Since K s = -4.00 for the secondary, for example, it is a hyperbola with 4.00 times the correction of a parabola, . This narrower cone of light "appears" to be the result of a longer focal length optic than the actual focal length of that primary mirror! The Maksutov-Cassegrain is a Maksutov telescope variant that is named after the Russian astronomer and optician Dmitri Dmitrievich Maksutov. Shop online -- Satisfaction guaranteed! Classical Cassegrains have no corrector, and tend to have long focal ratios, f/15 to f/25. Receive Exclusive Offers, Monthly Celestial Event Calendars & Access To Telescope Giveaway Contests! This design requires two aspheric mirrors (parabolic and hyperbolic). The telescopes with 400mm, 500mm and 600mm are built as Cassegrain or Ritchey- Chrétien systems. Maksutov-Cassegrain and Schmidt-Cassegrain are the most popular brands of composed telescopes, which are great for astrophotography, planetary and deep-sky viewing. You can adjust your cookie settings, otherwise we'll assume you're okay to continue. For comparison, at 0.5° off-axis, coma blur in an f/10 classical Cassegrain w/o corrector would be three times the Airy disc diameter, and in an f/5.9 as much as 14 times larger than the Airy disc (0.82 and 3.7 waves P-V, respectively). The components from the mechanics to the software, and also the optics fulfil the highest quality standards. 180/2700 Maksutov Casserain as it could possibly be a good scope for doing a bit of astrophotograpghy with if it also gave better planetary views, but now thinking after reading through the replies, I might be better of with a refractor for astrophotography work. A "large" aperture catadioptric scope can provide the observer with good light gathering ability, higher angular resolution, and some weight reduction when compared to a smaller aperture refractor! Found inside – Page 22Long focal length optical system generally adopts all-mirror structure, such as the classic Cassegrain system, ... In 1941, Maksutov presented a full-aperture corrector group with a meniscus thick lens instead of a Schmidt correction ... https://www.instructables.com/id/Equatorial-Platform-for-the-North/. Add Telescope Add Eyepiece Add Camera Add Binocular. Found inside – Page 1334[1–3] To correct these residual aberrations, a Classic Cassegrain system (Fig. 32A) was developed with a parabolic primary mirror with ... Somewhat later, a Maksutov Cassegrain system (Fig. 32B) was introduced using a meniscus corrector ... Your 16 inch dob should be providing superb planetary views from your location at 200x - 250x or more. Cassegrain and Ritchey-Chrétien (RC) telescopes are used by professional observatories, research institutions and universities. There are several different optical designs which fall into the catadioptric category, but they all have similar performance benefits. Let's examine the difference between those two categories. No. 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. In the case of a catadioptric system, with a central (circular) obscuration, this causes an effect known as apodization, which is a form of "spatial filtering". Catadioptric systems often require more frequent optical alignment than refractors. The author's cat is reading the fine print on the bottom of the dovetail plate. A simple cylinder of aluminum might be adequate construction to prevent flexure and keep the secondary and corrector aligned with the primary mirror. Found inside – Page 41In the classical Maksutov—Cassegrain telescope (shown here) the secondary mirror is actually formed from an aluminised spot at the centre of the corrector plate, but there is a 'Rumak' version of this telescope which has a separately ... Edited by TheFacelessMen, 20 July 2018 - 02:45 AM. Thus, weight reduction by virtue of size reduction makes the catadioptric design great for a beginner telescope. The aperture diameter has increased by only 3 inches while the weight has more than doubled. If you are getting fuzzy views at only 120x or up to 180x it suggests to me that your collimation may be off, or your primary mirror is not at ambient air temperature, I can't think of any other reason, your views should be tack sharp at those magnifications. 3 out of 4 ( 75%) reviewers recommend this product. One of these days I will be selling my 10", the 10" is more suitable for permanent installation which I do not have and hauling it to the backyard for each viewing session and bringing it back indoors is just too much of a hassle. Vendor Sky-Watcher USA Regular price $ 660.00 Sale price $ 660.00 Sale. Make sure the scope is fully cooled down before doing this. 127mm (5") aperture combined with a very long 1540mm focal length make the StarMax 127 a Maksutov-Cassegrain telescope with multiple proficiencies. The primary is a parabola, so we know how to test that. By using this site, you agree to our Terms of Use. Na ts sa mi páči to že je otvorený a aj cena je priaznivejšia. Whether you're visually observing or imaging, find your perfect Cassegrain Telescope for any use at OPT! The most popular optical designs of these telescopes are Schmidt-Cassegrains (SCT) and Maksutov-Cassegrains (MCT). This book provides all the essential and best elements of Kidger's many courses taught worldwide on lens and optical design. CFF from most reports makes some fine telescopes. These screws are then adjusted by the user to perform an optical alignment of the system when needed. We also crave high resolution in our equipment. Found inside – Page 202Fig. 11.7 The Maksutov Cassegrain design of the ETX offers up impressively sharp images when properly collimated (Image by the author) Fig. 11.8 The advertisement featuring the original ETX RA (Image. 202 11 Classic Cats. Assuming both have very good optical quality, I would think the 10" CC might perform better. DJ. Consider the history of observatory instruments for use by professional astronomers. Also the larger you go the longer the cooldown. A catadioptric telescope's moving parts are more complex than those found in refractor or reflector telescope.4. That's such a lovely looking setup! Syywatcher scopes are pretty good. Dmitry Maksutov of Russia invented the Maksutov optical system in 1941, but he waited until 1944 to publish a paper announcing his new design. With a manual dob you could consider buying or making an EQ platform which will give you around 45 minutes tracking between resets. Due to its unique and innovative design, the MAK telescope can use large-diameter optics without compromising the tube lengths. It's easier to comprehend and resolve details on extended objects when they are bright. Hi again @bluesilver, I know you are in Tasmania but even so, not far from me in Melbourne, and with Jupiter and Saturn at 75 degrees altitude I have no problem observing at 300x with my 12 inch SW Do. Reflectors, both Newtonian and compound, like Schmidt-Cassegrain, Maksutov, classical Cassegrain, etc. Long focal length of 1836mm (f/12) "folded" into an optical tube just 20.5" long - so you won't need a giant mount! The Maksutov-Cassegrain is a variation of the Maksutov telescope named after the Soviet/Russian optician and astronomer Dmitri Dmitrievich Maksutov.It starts with an optically transparent corrector lens that is a section of a hollow sphere. In this telescope type, optics are spherical with a classical Cassegrain secondary mirror replaced by a sub-aperture corrector group. Sub-aperture correctors for Dall-Kirkham telescope. $ 15,900.00. ready for shipping in 24 h. Meade Telescope ACF-SC 406/4064 16" UHTC LX200 GoTo. Answer (1 of 2): Most reflecting telescopes have central obstructions, but they don't produce blind spots in the visual field. The manufacturer can thus lower the purchase price for consumers. Found inside – Page 120Owners of classical Newtonian , SCT and other compound reflecting telescopes include routine collimation and ... Most Maksutov , Maksutov - Cassegrain , classical Cassegrain , Ritchey - Chrétien and other complex telescope types can ... The Schmidt-Cassegrain telescope is a member of the catadioptric optical family. Basically we are talking about reflectors (telescopes that employ mirrors), obstructed with secondary mirrors in the light path. It has a spherical primary mirror, and a spherical secondary that is usually a mirrored section of the corrector lens. The Maksutov-Cassegrain is a Maksutov telescope variant. Later, from 1955 to 1964, Tom Johnson had developed Celestron and was offering Schmidt-Cassegrain telescopes in various apertures. That results in long OTAs which can become quite heavy, require a large expensive mount for tracking, and are more difficult to balance on their mount. We do our best to add as many telescopes to the list as quickly as possible. Catadioptric designs (Maksutov-Cassegrain or Schmidt-Cassegrain) add a frontal lens, a refractive element which allow designers to have a third degree of freedom to further reduce various aberrations. This variant comprises an optically transparent corrector lens along with a section of a hollow sphere. The classical Cassegrain telescope optical system uses a parabolic primary mirror and a hyperbolic secondary. The views are definitely sharper on axis without it. If we remember that every optical design is always a compromise, that idea might help us to understand that choosing a particular telescope to buy can also be a compromise. An application-based decision is really the "professional" way to approach this process of choosing your best investment. They are lighter and more compact when compared to telescopes of the same aperture, as is the mount that holds them.3. Found inside – Page 66In fact , an entire family of teleCorrector scope designs has evolved from the plate classical Cassegrain , such as the Ritchey - Chrétien , Dall - Kirkham , Schmidt , and Maksutov Cassegrains . Schmidt Cassegrain The primary and ... Easy and very cheap to buil your own EQ platform. The Classical Cassegrain: Proven Excellence Posted on March 16, 2020 March 20, 2020 by Rodion Herrera Most telescope users are familiar with the Schmidt-Cassegrain design, a short-tube catadioptric that is that is quite popular among astronomy and astrophotography buffs. Classical Cassegrain - A classical Cassegrain uses a parabolic primary mirror, just like a Newtonian, but the secondary is a convex hyperbolic mirror. Both of them are foldable, have excellent optical quality and have features that can be added, such as motor-driven functionalities. Obviously at 200x the images are brighter and a tad sharper but still very good at 300x. This requires at least a minimal gap between the mirror and the tube. You need to be a member in order to leave a comment. Maksutov-Cassegrains have a thick, deeply curved spherical meniscus corrector. Not an issue in a Maksutov, if you insulate. During this time, amateurs were obliged to think about their pursuit of the hobby and decide whether they preferred a refractor or a reflecting telescope. This instrument will become one member of the next class of giant ground-based telescopes that promises to revolutionize an astronomer's view and understanding of the universe.
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