The Ttartisan ttartisan macro -fifth lens is a 60 mm equivalent, I offer a maximum magnification on a 1: 1 scale and a minimum sharpening distance 17cm. The optical design uses 8 elements in 7 groups to maintain constant image quality and sharpness in the whole range. 40 mm f/2.8 has a manual focus structure and an 11-year-old aperture, which provides a beautiful bokeh effect, thanks to which it is also an excellent portrait lens. Specification: Fastening: aperture range: F2.8 - F16 Minimum sharpening distance: 17 cm Enlargement: 1x macro reproduction coefficient: 1: 1 Number of aperture leaves: 11 filter diameter: 52 mm weight: 371 g