Camera having real-image finder and control method thereof

A control method for a camera,

• said camera comprising:
• a photographing optical system having a movable focusing element;
• a real image type finder optical system separate from said photographing optical system, said finder optical system having a movable finder focusing element;
• a split image prism provided in said real image type finder optical system in the vicinity of an image forming position thereof;
• an object distance data detector for detecting data representing the object distance;
• a photographing optical system driver which drives said movable focusing element in accordance with the data representing the object distance detected by the object distance data detector to form an in-focus object image on an image recording media;
• a finder optical system driver which drives said movable finder focusing element in accordance with the data representing the object distance detected by the object distance data detector to form an in-focus object image on said split image prism;
• a shutter release button and a photometering switch for photometering a brightness of the object, said photometering switch being turned ON by a half depression of said shutter release button;
• said method comprising:
• driving said finder optical system driver each time said photometering switch is turned ON by a half depression of a shutter release button;
• and
• driving said photographing optical system driver only when a full depression of the shutter release button takes place.

A camera comprising:

• a photographing optical system having a movable focusing element;
• a real image type finder optical system separate from said photographing optical system having a movable finder focusing element;
• a split image prism provided in said real image type finder optical system in the vicinity of an image forming position thereof;
• an object distance data detector for detecting data representing the object distance;
• a photographing optical system driver which drives said movable focusing element in accordance with the data representing the object distance detected by the object distance data detector to form an in-focus object image on an image recording media;
• and
• a finder optical system driver which drives said movable finder focusing element in accordance with the data representing the object distance detected by the object distance data detector such that an in-focus object image on said split image prism is obtained.