Home / Custom / Optical Lens / Medical Endoscope Objective / Gastroscopy & Colonoscopy Gastroscopy and colonoscopy are endoscopic instruments used to examine the gastrointestinal tract. They are characterized by clear imaging, a wide field of view, few blind spots, and ease of operation. The performance of the objective lens assembly directly determines the image quality of the endoscope. ECOPTIK supports customized gastroscopy and colonoscopy objectives.