The O2 Short Range Proximity Optical block adapts the sensor to the optical proximity mode of sensing, but on a sharp "V" axis to control depth of view. Range is dependent on model of the sensor selected.
The V1G (Glass Lens) Focused Lens "V" Axis optical block is for direct lens "V" axis sensing at close ranges. Use for small part or precise leading edge sensing. Range is dependent on model of sensor selected.