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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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David Stanley is the author of Moon Handbooks South Pacific http://www.southpacific.org/pacific.html which has a chapter on Easter Island. His online guide to Easter Island may be perused at http://www.southpacific.org/text/finding_easter.html
16a3 Ask me which Pacific island has the most to offer hikers and I'll probably answer Easter Island. Here on an island 11 km wide and 23 km long you'll find nearly a thousand ancient Polynesian statues strewn along a powerfully beautiful coastline or littering the slopes of an extinct volcano. Getting there is easy as Easter Island can be included in the Oneworld Explorer airpass introduced on http://www.southpacific.org/air.html , and a fine selection of inexpensive places to stay and eat await you.

The legends of Easter Island have been recounted many times. What's less known is that the island's assorted wonders are easily accessible on foot from the comfort of the only settlement, Hanga Roa. Before setting out see the sights, however, visit the excellent archaeological museum next to Ahu Tahai on the north side of town (the term ahu refers to an ancient stone platform). Aside from the exhibits, the museum has maps which can help you plan your trip. On online map is available at http://www.mapsouthpacific.com/easter_island/

The first morning after arrival, I suggest you climb Easter Island's most spectacular volcano, Rano Kau, where Orongo, a major archaeological site, sits on the crater's rim. But rather than marching straight up the main road to the crater, look for the unmarked shortcut trail off a driveway to the right just past the forestry station south of town. It takes under two hours to cover the six km from Hanga Roa to Orongo, but bring along a picnic lunch and make a day of it. (If climbing a 316-meter hill sounds daunting, you can take a taxi to the summit for around US$6 and easily walk back later in the day.) Once on top, you'll find hiking down into the colourful crater presents no difficulty. It may also look easy to go right around the crater rim, but only do so if you're a very experienced hiker and have a companion along as shear 250-meter cliffs drop into the sea from the ridge.

Another day, rise early and take a taxi to lovely Anakena Beach at the end of the paved road on the north side of the island (you should pay under US$10 for the 20 km). A few of the famous Easter Island statues have been restored at Anakena and you could go for a swim, although the main reason you've come is the chance to trek back to Hanga Roa around the road-free northwest corner of the island. You'll pass numerous abandoned statues lying facedown where they fell, and the only living creatures you're unlikely to encounter are the small brown hawks which will watch you intently from perches on nearby rocks. If you keep moving, you'll arrive back in town in five or six hours (but take adequate food, water, and sunscreen). This is probably the finest coastal walk in the South Pacific.

Almost as good is the hike along the south coast, although you're bound to run into other tourists here as a paved highway follows the shore. Begin early and catch a taxi to Rano Raraku, the stone quarry where all of the island's statues were born. This is easily the island's most spectacular sight with 397 statues in various stages of completion lying scattered around the crater. And each day large tour groups come to Rano Raraku to sightsee and have lunch. However, if you arrive before 9 am, you'll have the site to yourself for a few hours. When you see the first tour buses headed your way, hike down to Ahu Tongariki on the coast, where 15 massive statues were reerected in 1994. From here, just start walking back toward Hanga Roa (20 km) along the south coast. You'll pass many fallen statues and enjoy some superb scenery. Whenever you get tired, simply go up onto the highway and stick out your thumb and you'll be back in town in a jiffy.

An outstanding 13-km walk begins at the museum and follows the west coast five km north to Ahu Tepeu. As elsewhere, keep your eyes pealed for banana trees growing out of the barren rocks as these often indicate caves you can explore. Inland from Ahu Tepeu is one of the island's most photographed sites, Ahu Akivi, with seven statues restored in 1960. From here an interior farm road runs straight back to town (study the maps at the museum carefully, as you'll go far out of your way if you choose the wrong road here).

A shorter hike takes you up Puna Pau, a smaller crater which provided stone for the red topknots that originally crowned the island's statues. There's a great view of Hanga Roa from the three crosses on an adjacent hill and you can easily do it all in half a day. A different walk takes you right around the 3,353-meter airport runway, which crosses the island just south of town. Near the east end of the runway is Ahu Vinapu with perfectly fitted monolithic stonework bearing an uncanny resemblance to similar constructions in Peru.

Easter Island's moderate climate and scant vegetation make for easy cross country hiking, and you won't find yourself blocked by fences and private property signs very often. You could also tour the island by mountain bike, available from several locations at US$10 a day. If you surf or scuba dive, there are many opportunities here. A minimum of five days are needed to see the main sights of Easter Island, and two weeks would be far better. The variety of things to see and do will surprise you, and you'll be blessed with some unforgettable memories.

About the Author

David Stanley is the author of Moon Handbooks South Pacific http://www.southpacific.org/pacific.html which has a chapter on Easter Island. His online guide to Easter Island may be perused at http://www.southpacific.org/text/finding_easter.html

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