A set of jeweler's screwdrivers is an essential accessory for any serious photographer.

Vibrations from air, auto or train travel often cause small screws in lenses and cameras to loosen. These screws should be checked often, tightened when necessary, and fitted in place so that they don't work themselves loose again.Marty Forscher, New York's master camera repairman, suggests using a drop of clear nail polish on the head of the screw once it has been tightened. Nail polish will hold the screw securely in place, but will not seal it so tightly that the screw cannot be removed, if necessary, for a repair job.

Never use glue. It could seal the screws in so securely that they will have to be drilled out, resulting in a repair bill that could be astronomical.

There are many jeweler's screwdrivers on the market. Porter's Camera Store Inc. (Box 628, Cedar Falls, IA 50613) offers a dandy little job for $4.95, plus postage. It's just 2 inches long and has two heads - a slot head and a cross head. (I've also used mine to repair my eyeglasses!) It has a loop on one end so it can be attached to a key ring.

Write to Porter for more information, or for a copy of their free 112-page photo and video catalog.

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Where I live in the "boonies," atop a mountain in the Adirondacks in upstate New York, TV reception is terrible. Cable TV isn't available, so I've been seriously thinking about getting a satellite dish. A dish would make it possible for me to watch Kodak's "Techniques of the Masters," broadcast periodically, free and clear, on Kodak Business Television (KBTV).

The series' next video conference, the second in 1989, will be broadcast on Thursday, April 6, at 9 a.m. and 1 p.m. EST. It will feature top fashion and beauty photographer Joyce Tenneson and West German photography professor Harald Mante. The program will also feature a segment on choosing a photography workshop.

Tenneson began her career as a fine-art photographer. She taught for 15 years at the Corcoran School of Art. Today, she devotes nearly all her time to fashion and beauty photography, and her images have appeared in such magazines as Vogue and Taxi. She still pursues her fine-art work. Her images of the human figure have been described as "mesmerizing, haunting and truly beautiful."

Mante - nicknamed "Color Harry" - teaches color photography at the Fachhochschule, a prestigious photography school in Dortmund, West Germany. He is known for teaching a style that emphasizes the role of design in photography, and his students have a reputation for consistently producing professional-caliber work. He has written 17 books on photography; six have been published in the United States.

During the live portion of the program, Mante and Tenneson will discuss their work methodologies and answer questions phoned in by viewers.

A video conference segment will focus on points to consider when choosing a photo workshop. Scenes from workshops in the United States and Europe will be shown.

Steerable satellite dishes equipped for C or KY bands can receive the April 6 video conference, which may be taped for educational use.

For further information and locations of volunteer host facilities, call 1-(800) 44-KODAK, ext. 910; in Canada, call 1-(800) 46-KODAK, and ask for Anil Lelani.

Kodak began broadcasting the video conferences in 1987, and the programs have been enthusiastically embraced by professional photographers, photography students and instructors, according to Ray DeMoulin, Kodak vice president and general manager of the professional photography division.

Two more "Techniques" video conferences are slated for this year, with Jay Maisel and Duane Michals among the featured photographers.