Terry L. West 
I 
Telephotos 
Multipurpose 
Let You Reach Out... 
A long focal length telephoto lens is 
irreplaceable for many aspects of sports, 
nature and action photography— there are 
many times when only a "long" lens can 
achieve the right framing, isolate a subject 
against a complex background or provide 
the image scale you want for dramatic, 
artistic photographs. 
Only Celestron offers a complete range 
of compact, mirror-lens telephoto lenses 
of 300 to 3910mm focal lengths that can 
also be used as visual spotting scopes and 
high quality, large aperture astronomical 
telescopes. 
You are invited to see the multipurpose 
Celestrons at your local camera dealer and 
to learn about the full potential of a Celes- 
tron by sending for our beautiful, full-color, 
52-page catalog describing our complete 
telephoto, astronomical telescope and 
binocular lines. 
You'll be surprised at how little a Celes- 
tron costs— far, far below equivalent, bulky 
conventional telephoto lenses that have 
none of the versatility of a Celestron. 
To capture the unusual 
Celestron 750mm f/6 Photograph 
Free 8-page brochure or send $3.00 for 52-page 
full-color catalog on how to select and use a 
Celestron telescope/telephoto lens. 
ueiestron * International 
2835 Columbia St., (Box 3578-NH2) 
Torrance, Calif. 90503, U S A. 
Telephone: (213) 328-9560 
Dealer inquiries invited. 
GALAPAGOS 
ISLANDS 
CRUISE 
June 5-17, 1982 
Discover a naturalist’s paradise: a vol- 
canic archipelago straddling the equator 
and home to unique and tame animals. 
Share a relaxed holiday aboard the com- 
fortable M.V. Buccaneer with three 
American Museum curators— all experts 
in their fields; ornithology/ecology, geol- 
ogy/volcanology, herpetology/evolution. 
Enjoy superb climate, sandy beaches, fan- 
tastic photographic opportunities, and 
good company. Limited to 65 passengers. 
For further information write to 
DISCOVERY TOURS, American Museum 
of Natural History, Central Park West at 
79th Street, New York, NY 10024, or call 
(212)873-1440. 
On the caravan accompanied by the 
author, above, there were fifty-five 
llamas, as well as three burros to 
carry utensils and provisions. Loads 
were rotated each day so that fatigued 
llamas could have a respite. 
they had acquired: Sergio had fourteen 
cargoes of corn (700 pounds) and Gre- 
gorio only ten. Hilario declared his in- 
tention to work in Santa Cruz the next 
year and purchase maize in the valley 
with part of his earnings. None of them 
planned to travel with llamas any more. 
Archeological evidence indicates that 
llama caravans existed in the Andes 
almost 4,000 years ago, but the system 
of interdependence that has for so long 
operated between highland drovers and 
their valley trade partners is breaking 
down under the impact of commercial- 
ism. Markets have eroded the barter 
system that prevailed for centuries, and 
middlemen, traveling in trucks and 
buying maize with cash, have forced 
down the exchange rates, which once 
were more favorable to drovers. 
Traditionally, the primary goal of all 
drovers was the provisioning of their 
households, not monetary gain; they 
were concerned with the quantities of 
products traded, rather than their mone- 
tary values. This ideal is reflected in the 
traders’ custom of not mentioning the 
cash value of exchange items during 
their transactions. Lately, however, mi- 
grant labor opportunities created by an 
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