The scale has three marks: 1: 9, 1: 6 and 1: 4.5.

Additionally, the lens has a scale that shows magnification factor. There is an orange 'R' mark for working in the infrared spectrum. The depth of field scale is available for F / 4, 5.6, 8, 11, 16, 22. On the other aperture values, except F / 2.8, the petals form a regular hexagon.Additional tagsThe focus distance scale is in meters and feet. At F / 4 and at an intermediate value between F / 4 and F / 2.8, the diaphragm blades form small nicks. The prefix 'MINI-WIDE' in the name of the lens means 'mini-wide-angle'Number of aperture blades6 pieces, matte. SIGMA also made this lens for other mounts.Front Filter Diameter52 mm, the lens can only use a hood that is screwed into the threads of the front filterFocal length28 mm, EGF for cameras with crop factor 1.5 X is 42 mm. SIGMA 28mm f2.8 MINI-WideII Lens Minolta MD Fitting (serial no 1104828) this lens is im excellent condition all optics are excellent, lovely lens and very smooth focussing!!he lens specifications are shown in the table:Review Instance NameSIGMA MINI-WIDE II 1: 2.8 f = 28mm MULTI-COATED ⌀52 LENS MADE IN JAPAN, MACRO, FOR-KONICA, 4273607A typewide-angle fast discrete lens for full-format film cameras with Konica AR mount. Location: Milton Keynes, Buckinghamshire,

Sigma serial numbers lens