Lens problem... I have two lenses for my Pentax ZX-30; one Quantaray 55mm and a Quantaray 62mm telephoto. I can take pictres just fine when I affix the 62mm telephoto lens but when I switch back to the regular 55mm lens and turn it on, the LCD panel flashes "Av - -" in the lower left hand corner and won't take pictures. It seemed to start doing this out of nowhere one day in between routine lens-switches. I've tried every conceivable combination on the mode dial to no success. Any thoughts?

You are experiencing lack of communication between the shorter lens and the camera body. Since the longer lens works correctly the problem is in the other lens and not the camera body. BTW-the numbers 62mm & 55mm are probably the filter sizes for each lens and not the focal lengths. Unscrew the filters and you will probably find a name ring on the lens signifying the type of lens it is(e.g. 28-80 or 70-200 or something like that.) Look at the rear mount of the problem lens. There are some small metal(5-6) contacts there. Make sure the contacts are clean. If not, clean them with a soft rag or Q-tip. If they seem to be OK then there may be a problem inside the lens with the flexible printed circuit(FPC). The FPC may have been damaged somehow. If this is the problem take the lens to a competent repair shop and have them evaluate it. Depending on exactly which lens it is, it may be cheaper to replace the lens rather than repair it--but have it looked at anyway. Hope this helps.