System including endoscope and disposable protection cover with channel

An endoscope system comprising:

• a first endoscope of image guide fiber bundle type having a housing of an operation section;
• an image guide optical fiber bundle extending within said housing;
• an eyepiece section, supported by said housing, for inspecting an image of an object which is transmitted by means of said image guide optical fiber bundle;
• a shaft extending from said housing;
• and at least one angle knob detachably secured to said shaft;
• and
• a second endoscope of solid state image sensing type having a housing of an operation section;
• a solid state image sensor, supported by said housing of said second endoscope, for converting an image of an object into an image signal;
• a switch section, supported by said housing of said second endoscope, for controlling the image picked up by said solid state image sensor;
• a shaft extending from said housing of said second endoscope;
• and at least one angle knob detachably secured to said shaft;
• a first protection cover covering at least said housing of said first endoscope;
• and
• a second protection cover covering at least said housing of said second endoscope, wherein said angle knob and said shaft of said first endoscope and said shaft of said second endoscope are constructed such that said angle knob of the first endoscope can be detachably secured to said shaft of said second endoscope.