optical eye level finder

eye level view finder

eye-level view-finder

bull‘s eye level

bull’s eye level

bull-eye level

eye level

Eye-Level

view finder eye

LEVEL level

an eye for an eye

an eye for an eye and a tooth for a tooth

eye and eye turnbuckle

eye relief (=eye-point distance)

eye relief，eye distance

eye to eye contact

eyetoeye contact

4-level frequency modulation (4-level FM)

bi-level programming model with two lower level models