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Topic: Schmidt-Cassegrain

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Schmidt-Cassegrain telescope - Wikipedia, the free encyclopedia A Schmidt-Cassegrain Telescope, invented by Bernhard Schmidt, is a catadioptric telescope. From the Cassegrain, it inherits the convex secondary mirror, perforated primary mirror, and a final focal plane located behind the primary. This type of telescope is advantageous because it combines the long focal length of the refracting telescope with the lower cost per aperture of the reflecting telescope. en.wikipedia.org /wiki/Schmidt-Cassegrain   (340 words)

The Celestron 11" Schmidt-Cassegrain - Bad Astronomy and Universe Today Forum A Cassegrain configuration telescope whose optics consist of a concave primary mirror, which is spherical in most of the common commercial designs, a full-aperture Schmidt corrector plate mounted near the focal point of the mirror, and a small, convex secondary mirror positioned in the converging beam, as in a true Cassegrain. Schmidt Cassegrains are a derivation of the Schmidt camera invented by Bernhard Schmidt, which instead of a secondary mirror at prime focus has a camera (or photgraphic plate when first invented). In some, the only difference from the classical Cassegrain is that the two mirrors are not the traditional paraboloid/hyperboloid combination. www.bautforum.com /showthread.php?t=26534   (3386 words)

Cassegrain telescope The Dall-Kirkham telescope is a variant of the Cassegrain that uses a concave ellipsoidal primary mirror and a convex spherical secondary. In an alternate scheme, called a modified Cassegrain, a small optical flat placed immediately in front of the primary brings the light out to the side of the telescope tube and eliminates the need for a perforated primary. Like the Gregorian and Newtonian telescopes, the paraboloid-hyperboloid combination of the Cassegrain is free from spherical aberration. www.daviddarling.info /encyclopedia/C/Cassegrain_telescope.html   (271 words)

Celestron -- Telescope Basics In the Schmidt-Cassegrain the light enters through a thin aspheric Schmidt correcting lens, then strikes the spherical primary mirror and is reflected back up the tube and intercepted by a small secondary mirror which reflects the light out an opening in the rear of the instrument where the image is formed at the eyepiece. The Maksutov is heavier than the Schmidt and because of the thick correcting lens takes a long time to reach thermal stability at night in larger apertures (over 90mm). The Maksutov secondary mirror is typically smaller than the Schmidt's giving it slightly better resolution for planetary observing. www.celestron.com /tb-2ref.htm   (878 words)

Evolution of the Maksutov-Cassegrain Telescope by John F. Gills, Ph.D. Later the Schmidt Corrector Plate was applied to the Cassegrain design and the Schmidt-Cassegrain Telescope was born. This was in 1930 when an Estonian astronomer, lens and mirror maker, Bernard Schmidt, developed a lens called a 'corrector plate' that would compensate for the Cassegrain's optical distortion - specifically it corrected for spherical aberration. In the Schmidt Camera, a curved photographic plate holder was positioned at the focal plane of the main mirror for maximum sharpness. www.weasner.com /etx/guests/mak/MAKSTO.HTM   (414 words)

New optical systems for small-size telescopes, by Yu. A. Klevtsov These systems, which were designed according to the Cassegrain scheme, have several design advantages: small dimensions, an absence of aspherical surfaces that complicate mass production, and correcting lenses of small diameter (close to 1/3 of the effective aperture of the system). The novel systems for Cassegrain telescopes with a meniscus corrector proposed here are free of these deficiencies. In his second system [2] with an afocal corrector placed at a short distance from the secondary mirror, it was not possible to eliminate the parasitic background to the required extent, despite the good correction of aberrations. www.telescopes.ru /articles/article1.phtml   (3099 words)

Schmidt-Cassegrain -- Facts, Info, and Encyclopedia article The (additional info and facts about Schmidt-Cassegrain) Schmidt-Cassegrain, invented by (additional info and facts about Bernhard Schmidt) Bernhard Schmidt, is similar to the (additional info and facts about Cassegrain) Cassegrain. This is corrected by a (additional info and facts about Schmidt corrector plate) Schmidt corrector plate. This type of telescope has some of the advantages of the (additional info and facts about refractor) refractor (long focal length) and some of the advantages of the (Device that reflects radiation) reflector (low cost for larger apertures). www.absoluteastronomy.com /encyclopedia/s/sc/schmidt-cassegrain1.htm   (109 words)

Schmidt-Cassegrain telescope A variation of the Schmidt camera to enable visual observation. In uses a convex spheroidal secondary mirror to reflect the converging beam from the primary back through a central hole in the primary, allowing an eyepiece to be mounted at the back end of the tube. www.daviddarling.info /encyclopedia/S/Schmidt-Cassegrain_telescope.html   (170 words)

Lumicon Easy Guider for 7-9 SCT's The all-in-one Lumicon Cassegrain Easy-Guider™ is one of the most powerful astrophoto/visual accessories on the market today, greatly extending the visual and photographic capabilities of your 7" to 9.25" Schmidt-Cassegrain telescope. Lumicon Cassegrain Easy-Guider™ for 7"- 9.25" Schmidt-Cassegrain Telescopes. Exposure durations with the Lumicon Cassegrain Easy-Guider are thus 2 to 4 times shorter, and the visual field-of-view is increased. www.lumicon.com /eg7.htm   (358 words)

Schmidt Cassegrain Collimation Unlike my recommendation to perform the collimation of a newtonian during daylight hours, collimating a schmidt cassegrain is most easily done at night. In many ways a schmidt cassegrain is easier to collimate. The only thing you should have already done while it was still light outside is to become familiar with the location of the collimating screws on the front of the telescope. www.astro-tom.com /telescopes/schmidt_cassegrain.htm   (640 words)

Schmidt-Cassegrain telescope - Wikipedia, the free encyclopedia 26 in (660 mm) Schmidt-Cassegrain telescope at the UCF Robinson observatory. A Schmidt-Cassegrain Telescope, invented by Bernhard Schmidt, is a catadioptric telescope. From the Cassegrain, it inherits the convex secondary mirror, perforated primary mirror, and a final focal plane located behind the primary. en.wikipedia.org /wiki/Schmidt-Cassegrain   (640 words)

Cat Scopes Schmidt Cassegrains (Celestron C5 and Bausch and Lomb 8080) use a flatter, but more complexly shaped corrector plate, with a separate secondary mirror bolted to it in its own adjustable mount. It is a modified Schmidt Cassegrain design with an 80mm main mirror, and multicoating on the corrector plate. The B&L;8080 is actually a modified Schmidt design, since it uses a small compound lens placed in the light path after the secondary mirror. betterviewdesired.com /Cats.html   (6895 words)

Encyclopedia of Astronomy and Astrophysics » Schmidt–Cassegrain Telescope The principal optical components of the Schmidt–Cassegrain are a concave primary mirror, a thin corrector lens located close to the focus of the primary, and a convex secondary (which is often attached directly to the inside of the corrector lens), which reflects light through a central hole in the p... A form of telescope that combines some of the features of the Schmidt and the Cassegrain systems. eaa.iop.org /index.cfm?action=summary&doc=eaa/4724@eaa-xml   (91 words)

Schmidt-Cassegrain Telescopes Schmidt-Cassegrain, or catadioptric, telescopes use a combination of mirrors and lenses to fold the optics and form an image. Incoming light enters through a thin aspheric Schmidt correcting lens, then strikes the spherical primary mirror and is reflected back up the tube. The light is then intercepted by a small secondary mirror which reflects the light out an opening in the rear of the instrument, where the image is formed at the eyepiece. www.catsanddogspa.com /schmidt.html   (523 words)

Howstuffworks "How Telescopes Work" The Schmidt telescope had a primary mirror at the back of the telescope, and a glass corrector plate in the front of the telescope to remove spherical aberration. The first compound telescope was made by German astronomer Bernhard Schmidt in 1930. The telescope was used primarily for photography, because it had no secondary mirror or eyepieces -- instead, photographic film was placed at the prime focus of the primary mirror. science.howstuffworks.com /telescope4.htm   (270 words)

Astronomy Telescopes, Accessories, CCD and Digital Cameras - Oceanside Photo & Telescope When you put the "Schmidt" and the "Cassegrain" together, you get a telescope that is very compact for it's aperture size but that yields deep-sky and planetary views of extreme quality. The "Schmidt" part of the Cassegrain system has to do with a specially-shaped corrector plate of complex design that "caps" the front end of the tube assembly. The Schmidt-Cassegrain telescope is among the most popular of the telescope designs today, simply because of these attributes and the fact that an amazingly wide variety of accessories is available for this most-favorite of telescopes. www.optcorp.com /info_catadioptric.aspx   (1335 words)

Schmidt Cassegrain Telescope and focal reducer design with CB245 ccd image examples" Schmidt Cassegrain owners can discover how to measure and compute the focal ratio changes of their telescope from adjustments to the focus control, with my report. The site covers the design and calibration of Schmidt Cassegrain telescopes and focal reducers, with examples of CB245 ccd and photographic imagery. Schmidt Cassegrain Telescope and focal reducer design with CB245 ccd image examples" mypage.direct.ca /r/rad   (123 words)

Compare Prices and Read Reviews on Celestron Nexstar 8 GPS Schmidt Cassegrain Telescope at Epinions.com A Schmidt Cassegrain Telescope, or SCT, typically has proportions similar to a mid-sized coffee can at any diameter. These telescopes were derived from a design Estonian optician Bernard Schmidt developed to make large photographic telescopes with flat fields of view in the era before hyperbolic mirrors could be reliably made. In the 1960s, the people behind Celestron realized the Schmidt design previously used for observatory survey cameras was very practical for making an extremely compact telescope compared to its focal length. www.epinions.com /content_107837886084   (5084 words)

Inventors and Inventions: S - EnchantedLearning.com The Cassegrain telescope (named for the French sculptor Sieur Guillaume Cassegrain) was developed in 1672; the correcting plate (a lens) was added in 1930 by the Estonian astronomer and lens-maker Bernard Schmidt (1879-1935). A second mirror reflects the light through a gap in the primary mirror, allowing the eyepiece or camera to be mounted at the back end of the tube. www.enchantedlearning.com /inventors/indexs.shtml   (2888 words)

Schmidt-Cassegrain By folding the light path a Schmidt- Cassegrain telescope (or SCT) is much more compact than an equal-aperture refractor or Newtonian. Schmidt-Cassegrains use a spherical primary mirror to focus incoming light onto a convex secondary mirror which sends the light back through a hole in the primary mirror to the eyepiece, located at the rear of the telescope. All of the professional telescopes built recently, from Hubble to Keck, are based on the folded Cassegrain design. www.starizona.com /basics/sct.html   (233 words)

Schmidt-Cassegrain Collimation Issues First save your money don't buy a tool they don't work on Cassegrain telescopes that well due to the folded optics and optical alignment problems both mechanical and optical. ONE great way to collimate better than collimater tools including laser which are soso for schmidt cass scopes. I know many tricks of the optics trade and also EQ mounts can be made very well improved with little or no money just time and patience. www.cloudynights.com /item.php?item_id=350   (1331 words)

JMI NGF-CM Next Generation Focuser 2" Schmidt-Cassegrain with Motofocus. A 2" black-anodized aluminum focuser designed for use on 8" to 16" Schmidt Cassegrain Telescopes (SCTs) with standard output threads, as well as the Meade 7" Maksutov-Cassegrain telescopes. The most popular type of Cassegrain telescope is the Schmidt-Cassegrain Telescope (SCT). The NGF-C and NGF-miniC are specifically designed for Cassegrain telescopes. www.adorama.com /ATNGFCM.html   (322 words)

Schmidt Cassegrain telescope advice - books for visual observing It doesn’t have as much detail as Inglis’ Guide but it is illustrated with some of the original schmidt camera photographs taken of deep-sky objects - Vehrenberg was a pioneer of modern astrophotography and his images are absolutely beautiful. The Universe: a device devised for the perpetual astonishment of astronomers. Brunier’s book is intended to be a beginner’s guide to observing objects in each of various constellations. sctscopes.net /Observing_with_an_SCT/Books/books.html   (2424 words)

Kendrick Astro Instruments - Laser Collimators, Collimators, Green Laser, SCT Collimation There are a lot of misconceptions about collimating a Schmidt Cassegrain Telescope with a laser and I have had many people get back to me asking for clarification on this matter. This is an attempt to dispel some of these misconceptions. www.kendrick-ai.com /astro/misconceptions.html   (894 words)

Att välja teleskop - refraktor, reflektor, katadioptriska, Schmidt-Cassegrain År 1672 uppfann Cassegrain en reflektor som använde sig av en konkav huvudspegel som samlade in ljuset från himlen och reflekterade det till en konvex justerbar sekundär-spegel. Ljuset speglades sedan ner genom ett hål i primär-spegeln till "Cassegrain" fokus. www.astromedia.se /kunskapslyftet/teleskoptyper.htm   (2967 words)

The Birch Grove Observatory A backyard observatory with a 3-metre dome and bi-parting shutters housing a Meade LX200 10" F10 Schmidt Cassegrain telescope. This web site was created to provide information about the design and construction of a small astronomical observatory. E-Mail: peter dot sullivan1 at ntlworld dot com homepage.ntlworld.com /peter.sullivan1   (177 words)

Schmidt Cassegrain telescope advice - observing, accessories, & astrophotography Athough a few parts of this site are oriented towards the U2K, in general the information here is applicable to using any telescope, particularly catadioptric (either Celestron or Meade Schmidt - or Maksutof - Cassegrain) scopes including Celestron C-8s and larger, or Meade LX scopes. Schmidt Cassegrain telescope advice - observing, accessories, & astrophotography A telescope is a significant investment for most of us. www.sctscopes.net   (528 words)

Amazon.co.uk: The 20-cm Schmidt-Cassegrain Telescope: A Practical Observing Guide: Books I found this book to be really helpful in understanding the capabilities of what an 8" Schmidt Cassegrain Telescope is capable of doing, especially when it comes to Astrophotography. Other then that I would recommend this book to anyone owning a Schmidt Telescope be it from Celestron or Meade. Plenty of helpful hints, although my only dislike about the book was it contained pictures which I found to be a bit outdated as other Authors are using Colour prints. www.amazon.co.uk /exec/obidos/ASIN/0521644410   (631 words)

Cassegrain collimation The techniques listed here were developed to collimate a Dall-Kirkham Cassegrain (a Takahashi Mewlon 210), but they apply to some degree to many types of telescopes (Schmidt-Cassegrain, Ritchey-Chretien, classical Cassegrain, etc.). Collimation is important on any telescope, but it is particularly important on many Cassegrain designs because mis-collimation causes poor resolution. Collimation seems like such a simple thing, but there are plenty of subtle touches you can learn to make collimation easier. www.multimediamadness.net /wodaski/collimation_cass.htm   (1427 words)

Astronomy Today: Telescope Buyers' FAQ Schmidt- Cassegrains, Newtonian reflectors, and refractors all have good and bad points. Pictures can be seen in the ads in any issue of a popular astronomy magazine: the Meade 2080 and the Celestron C-8 are examples of Schmidt- Cassegrain; the Celestron C-90 and Questar are examples of Maksutov-Cassegrain. There's a qualifier here: What makes them portable are short, stubby tubes, but for small apertures -- say, four inches or less -- portability of all types is dominated by clumsiness of the tripod, so the portability advantage of Schmidt- Cassegrains and Maksutovs diminishes. www.astronomytoday.com /astronomy/tbfaq.html   (13645 words)

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