The utility model relates to a kind of
digestive tract objective lens, the optical structure of
digestive tract objective lens includes first lens, second lens, third lens, diaphragm, fourth lens, fifth lens, sixth lens sequentially arranged from object side to image side direction along
optical axis, the first lens, second lens, third lens combination is front
group system, fourth lens, fifth lens, sixth lens combination is rear
group system, front
group system is divided into gastroscope front group
system and
enteroscope front group
system two kinds of forms, rear group
system is common to gastroscope front group system and
enteroscope front group system, the optical total length after the combination of gastroscope front group system and rear group system, the optical total length after the combination of
enteroscope front group system and rear group system is identical. The utility model design is reasonable, and aberration is balanced reasonably, with small volume,
imaging quality is good, lens common rear group, gastroscope system and enteroscope system common module and the like features.