Lens barrel with built-in ultrasonic motor, camera having lens barrel and method

An autofocus camera having a lens barrel, said camera being configured for photographing an object in at least a manual adjustment mode and an automatic focus adjustment mode, said lens barrel, comprising:

• a photography optical system;
• an ultrasonic motor having a vibrating member that generates ultrasonic vibrations and a relative moving member connected with said vibrating member that moves said photography optical system along an optical axis through the ultrasonic vibrations;
• an external manual operation member that is moved manually to move said photography optical system along said optical axis via said relative moving member;
• and
• a conversion device that reduces an amount by which said relative moving member moves in response to a amount by which said external manual operation member is moved, said conversion device being operatively connected to said external manual operation member and said relative moving member.