Macro lenses-attachments in frames with an optical power (in diopters) of + 0.5; +1; +2 in individual cases. 
They are used with professional shooting lenses to obtain very close-ups with a small depth of field. 
Sharp and high-contrast image without visible optical aberrations of traditional diopters thanks to the achromatic lens in the failure and a multi-layer coating that eliminates Zeiss T * glare. 
Full compatibility with all types of lenses through adapter rings.