Q. A friend told me you can use colored filters on color film. That sounds sort of screwy and self-defeating to me. What do you think?

A. Not screwy at all. Just understand that the results will be different from what you are used to. This is a special effects situation.

An orange filter will give a marvelous sense of warmth to sunrises and dusk shots. Yellow filters do interesting things to grass and reflected whites.

But it is the red filter that I really have fun with. Blue skies become mysterious. Yellows become rich orange, and grays and white take on a luster that will make your head spin.

Then there are the filters that have gradations of the same color. These can do such tricks as making the sky one shade of orange and the ground another.

Use transparency film if you're going to try these experiments. And remember that they are experiments. The filters aren't cheap; they cost around $10 apiece. MOVIE CAMERA BLUES

Q. I have a Bolex 8mm movie camera that was working well. I haven't used it in five years and now it will not run. I've been told that the Bolex company is no longer in business and parts are not available. I have made various inquiries at camera repair shops and no one will even check it out. I hope a simple cleaning and minor repairs without new parts will be all that is necessary. Can you give me any advice?

A. I'm sorry. The people I've called about this are not very encouraging. I haven't contacted every repair shop in the area, but if you are absolutely sure you want to pursue this, you have to keep calling till you find someone who'll look at it. I suggest that you get an estimate first. I've been told that this is a precision camera and even simple repairs can be very expensive.

My question to you is, have you considered switching to a small video camera? This is the wave of the future and the advantages seem to outweigh the disadvantages. The movie film you've shot over the years can be transferred to video cassettes, and you'll find that the cost of shooting new subjects is, foot-per-foot, far less with video tape.


Q. In that there are quite a few 35mm Mamiya users in this area, I would be interested in finding out whether or not there is an interest in starting a Mamiya users' group to provide a forum for learning more about the equipment and to serve as a clearing house for people who would like to buy, sell or trade equipment.

A. Good idea! I hope lots of Mamiya users will respond by dropping me a line. TAKE IT WITH YOU

Q. I've just returned from Europe, (three weeks in England and another two-week whirlwind tour of France, Germany and Italy) and would like to pass on some advice to anyone else going off on a long-term vacation.

When I left, I decided that I would take only my Canon AE1 Program and its 50mm lens. I didn't want to bother with any more equipment than necessary.

Now I know how wrong I was! Time after time I wished for my 80-210 zoom lens. And, when my camera quit, I longed for my other one, stored safely back home.

Tell the people out there not to fear a little extra camera-bag weight.

A. Amen, I say, amen! You paid good money for that equipment. Use it! PHOTO SEMINAR

The Greater Washington Council of Camera Clubs will hold its annual photographic seminar on April 5 at Woodrow Wilson High School, Nebraska Avenue and Chesapeake Street NW.

Workshops will include travel photography, photo composition, lighting, portraiture and photojournalism. Hours are 9 to 4, with a special 6 o'clock Kodak slide show, "Tribute to America's Park Lands."

Tickets for the entire program are $10, $6 for students. For more information, call 635-8102.