The following manufacturers make telescopes, mounts, filters, and other accessories that are popular with amateurs. The list is far from complete, and you can look at the latest sets of ads in Sky & Telescope (www.skypub.com) or Astronomy (www.astronomy.com) magazines.

Celestron International, 2835 Columbia St., Torrance, CA 90503. (310) 328 9560, fax (310) 212-5835; www.celestron.com. A wide variety of telescopes and binoculars.

DayStar Filter Corp., PO Box 5110, Diamond Bar, CA 91765-5110. (909) 591 4673. Solar hydrogen-alpha filters.

Edmund Scientific, 101 East Gloucester Pike, Barrington, NJ 08007-1380. (800) 728-6999, (609) 573 6250; e-mail: scientifics@edsci.com. Newtonian telescopes, refractors, and the elatively inexpensive ($329 as of this writing) wide-field Astroscan 2001 telescope, plus miscellaneous.

Lumicon Accessories, 2111 Research Drive, Livermore, CA 94550. (800) 767-9576, (925) 447 9570, fax (925) 447-9589; www.lumicon.com. Accessories, as well as binoculars and telescopes.

Meade Instruments, 6001 Oak Canyon, Irvine, CA 92620. (949) 451-1450, fax (949) 451-1460; www.meade.com. A wide variety of telescopes and binoculars.

Orion, P.O. Box 1715, Santa Cruz, CA 95061. (800) 447-1001; www.oriontel.com. A variety of binoculars, telescopes and accessories.

Questar Corp., 6204 Ingham Road, New Hope, PA 18938. (215) 862 5277, (800) 247-9607, fax (215) 862-0512. Expensive but high-quality 3.5-in. compact, Maksutov-type folded telescopes. www.questar-corp.com, e-mail: questar@erols.com.

SBIG (Santa Barbara Instrument Group), P.O. Box 50437, Santa Barbara, CA 93150. (805) 969-1851, fax (805) 969-4069; www.sbig.com; e-mail: sbig@sbig.com. Relatively inexpensive CCD cameras.

Tele Vue, 100 Route 59, Suffern, NY 10901. (914) 357-9522; www.televue.com. Eyepieces and refractors.

Thousand Oaks Optical, Box 4813, Thousand Oaks, CA 91359. (800) 996-9111, 805 491 3642. thousandoaksoptical.com; e-mail: info@thousandoaksoptical.com. Solar filters, both neutral density and hydrogen-alpha.

Tuthill, 11 Tanglewood Lane, P.O. Box 1086, Mountainside, NJ 07092, (800) 223-6999. www.tuthillscope.com. Tested telescopes and various accessories.

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