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Basic Telescope Designs

The job of a telescope is to collect light, not to magnify an image (the eyepiece does that job). The larger the objective (the part that collects the light) whether it be a lens, in refractors, or a mirror, in reflectors, the more light the telescope will collect. The more light you can collect, the more detail you will be able to capture, and also important for astrophotography, the shorter your exposures will need to be to capture this detail.

Refractor Telescopes

The type of telescope most people visualize when they hear the word telescope is the 'Refractor'. This is what Galileo used for his break-thru discoveries. A refractor has an objective lens at the front which passes the light straight through to the back of the tube, focusing this light at an eyepiece or for astrophotography a camera.

Advantages:

-No central obstruction (see more in the reflecting scopes), giving higher contrast.

-Due to the simple design they require little maintenance.

-Excellent for planetary and lunar viewing and photography.

-Excellent for wide field viewing and astrophotography especially in shorter focal lengths (more on this later).

-Because the objective is permanently mounted and aligned there is no need for collimation (again more on this in another article).

-Excellent color in apochromatic and ED (Extra Dispersion) designs.

Disadvantages:

-Costlier per inch of aperture (objective) than reflectors and catadioptric telescopes.

-Can become bulky and difficult to manage, especially in larger lens designs.

Newtonian Telescopes

This design was invented by Sir Isaac Newton (he of the apple on the head fame). Instead of a lens at the front of the tube this telescope design uses a concave, parabolic mirror to collect light reflecting it back towards the front of the tube to a flat diagonal mirror which reflects the light out the side of the telescope to the eyepiece or camera for astrophotography.

Advantages:

-Lowest cost per inch of all the telescope designs.

-More light gathering power per dollar because of the lower cost design.

-Absolutely perfect color rendition.

-More compact design compared to a refractor of similar light gathering ability.

-Excellent contrast for planetary and lunar astrophotography and viewing in longer focal lengths.

-Can get excellent wide-field astrophotos and short exposures in shorter focal lengths.

Disadvantages:

-Slight loss of contrast due to the central obstruction (the flat secondary mirror) as compared to a refractor.

-Requires more maintenance, such as collimation (discussed in another article) which is vital for great results in your astrophotography, although you will learn how to do this quickly with practice.

Schmidt-Cassegrain Telescopes

This is a very popular design, with a high tech look. Also known as a CAT (Catadrioptics). They use a combination of lenses and mirrors to collect and focus the light onto the eyepiece or camera. The light enters the telescope through a thin 'lens' called a schmidt corrector plate, goes to the back of the scope to a spherical primary mirror which reflects the light back towards the front. Here the light strikes another mirror, the secondary mirror which is mounted on the corrector plate. This secondary mirror then reflects the light back towards the back where it is focused onto a hole in the primary mirror where the light is collected by an eyepiece or your astrophotography camera.

Advantages:

-Compact and portable.

-Low maintenance although once again collimation is required for top performance.

-Many, many astrophotography accessories available.

-Cheaper per inch of aperture as compared with refractors.

-Excellent all-round telescope, good to very good for both visual and astrophography.

-Very good for planetary and lunar viewing and astrophotography.

-Very good to excellent for DSO (Deep Space Object) astrophotography with a caveat (see the disadvantages).

-Very good to excellent optics, both Meade and Celestron are putting out excellent optics on a consistant basis.

Disadvantages:

-Costlier per inch of aperture as compared with Newtonian telescopes.

-Loss of contrast due to the central obstruction which is even larger than that in the Newtonian scopes.

-Due to their longer focal lengths the field of view is smaller and longer exposures are required for astrophotography, although a lens known as a focal reducer is available which minimizes or removes this problem. The longer focal length is actually an advantage in planetary and lunar photography.

Maksutov-Cassegrain

The Maksutov-Cassegrain telescope design is basically the same as the Schmidt-Cassegrain design except it uses a meniscus lens at the front instead of a Schmidt corrector plate. The main advantage to the Mak telescope design is you will get sharper higher contrast planetary and lunar images when compared with the Schmidt design.

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Maps of Cyberspace
Sam Vaknin
1951 Cyberspace. A consensual hallucination experienced daily by billions of legitimate operators, in every nation, by children being taught mathematical concepts...A graphical representation of data abstracted from the banks of every computer in the human system. Unthinkablecomplexity. Lines of light ranged in the non-space of the mind, clusters and constellations of data. Like city lights, receding... (William Gibson, Neuromancer, 1984, page 51)

http://www.ebookmap.net/maps.htm

http://www.cybergeography.org/atlas/atlas.html

At first sight, it appears to be a static, cluttered diagram with multicoloured, overlapping squares. Really, it is an extremely powerfulway of presenting the dynamics of the emerging e-publishing industry. R2 Consulting has constructed these eBook Industry Maps to reflect the evolving business models among publishers, conversion houses, digital distribution companies, eBook vendors, online retailers, libraries, library vendors, authors, and many others. These maps are 3-dimensionaloffering viewers both a high-level orientation to the eBook landscape and an in-depth look at multiple eBook models and the partnerships that have formed within each one. Pass your mouse over any of the squares and a virtual floodgate opens - a universe of interconnected and hyperlinked names, a detailed atlas of who does what to whom.

eBookMap.net is one example of a relatively novel approach to databases and web indexing. The metaphor of cyber-space comes alive in spatial, two and three dimensional map-like representations of the world of knowledge in Cybergeography's online Atlas. Instead of endless, static and bi-chromatic lists of links - Cybergeography catalogues visual,recombinant vistas with a stunning palette, internal dynamics and an intuitively conveyed sense of inter-relatedness. Hyperlinks are incorporated in the topography and topology of these almost-neural maps.

These maps of Cyberspaces - cybermaps - help us visualise and comprehend the new digital landscapes beyond our computer screen, in the wires of the global communications networks and vast online information resources. The cybermaps, like maps of the real-world, help us navigate the new information landscapes, as well being objects of aesthetic interest. They have been created by 'cyber-explorers' of many different disciplines, and from all corners of the world. Some of the maps ... in the Atlas of Cyberspaces ... appear familiar, using the cartographicconventions of real-world maps, however, many of the maps are much more abstract representations of electronic spaces, using new metrics and grids.

Navigating these maps is like navigating an inner, familiar, territory.

They come in all shapes and modes: flow charts, quasi-geographical maps, 3-d simulator-like terrains and many others. The web Stalker is an experimental web browser which is equipped with mapping functions. The range of applicability is mind boggling.

A (very) partial list:

The Internet Genome Project - open-source map of the major conceptual components of the Internet and how they relate to each other

Anatomy of a Linux System - Aimed to ...give viewers a concise and comprehensive look at the Linux universe' and at the heart of the poster is a gravity well graphic showing the core software components,surrounded by explanatory text

NewMedia 500 - The financial, strategic, and other inter-relationshipsand interactions between the leading 500 new (web) media firms

Internet Industry Map - Ownership and alliances determine status, control, and access in the Internet industry. A revealing organizational chart.

The Internet Weather Report measures Internet performance, latency periods and downtime based on a sample of 4000 domains.

Real Time Geographic Visualization of WWW Traffic - a stunning, 3-d representation of web usage and traffic statistics the world over.

WebBrain and Map.net provide a graphic rendition of the Open Directory Project. The thematic structure of the ODP is instantly discernible.

The WebMap is a visual, multi-category directory which contains 2,000,000 web sites. The user can zoom in and out of sub-categories and unlock their contents.

Maps help write fiction, trace a user's clickpath (replete with clickable web sites), capture Usenet and chat interactions (threads), plot search results (though Alta Vista discontinued its mapping service and Yahoo!3D is no more), bookmark web destinations, and navigate through complex sites.

Different metaphors are used as interface. Web sites are represented as plots of land, stars (whose brightness corresponds to the web site's popularity ranking), amino-acids in DNA-like constellations,topographical maps of the ocean depths, buildings in an urban landscape, or other objects in a pastoral setting. Virtual Reality (VR) maps allow information to be simultaneously browsed by teams of collaborators, sometimes represented as avatars in a fully immersive environment. In many applications, the user is expected to fly amongst the data items in virtual landscapes. With the advent of sophisticated GUI's (Graphic UserInterfaces) and VRML (Virtual Reality Markup Language) - these maps may well show us the way to a more colourful and user-friendly future.


About the Author

Sam Vaknin is the author of Malignant Self Love - Narcissism Revisited and After the Rain - How the West Lost the East. He is a columnist for Central Europe Review, United Press International (UPI) and eBookWeb and the editor of mental health and Central East Europe categories in The Open Directory, Suite101 and searcheurope.com.


Visit Sam's Web site at http://samvak.tripod.com

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