Minolta SR mount 28mm Lenses

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MC W.Rokkor 28mm 1:2 Focal length 28mm Speed 1:2 Minimum focus distance 0.3m Optical design (elements/groups) 10/9 Filter thread size 55mm Weight 340g Introduced 1975 The first version of the fast 28mm lenses; my sample has severe separation. Picture gallery 10

MC W.Rokkor-X 28mm 1:2 Focal length 28mm Speed 1:2 Minimum focus distance 0.3m Optical design (elements/groups) 10/9 Filter thread size 55mm Weight 340g Introduced 1975 The American variant of the fast MC version Picture gallery 15

MD W.Rokkor 28mm 1:2 Focal length 28mm Speed 1:2 Minimum focus distance 0.3m Optical design (elements/groups) 10/9 Filter thread size 55mm Weight 340g Introduced 1977 The MD version of the fast 28mm lens Picture gallery 20

MD 28mm 1:2 Focal length 28mm Speed 1:2 Minimum focus distance 0.3m Optical design (elements/groups) 9/9 Filter thread size 49mm Weight 265g Introduced 1981 The last version of the fast 28mm lenses, this type doesn't have cemented elements anymore and is lighter and smaller. Picture gallery 30

MC W.Rokkor-SI 28mm 1:2.5 Focal length 28mm Speed 1:2.5 Minimum focus distance 0.5m Optical design (elements/groups) 9/7 Filter thread size 55mm Weight 340g Introduced 1969 First version of the 28/2.5 Picture gallery 40

MC W.Rokkor-SI 28mm 1:2.5 Focal length 28mm Speed 1:2.5 Minimum focus distance 0.5m Optical design (elements/groups) 9/7 Filter thread size 55mm Weight 340g Introduced 1969 Second version with the hills-and-dales focussing ring Picture gallery 50

MC W.Rokkor-SI 28mm 1:2.5 Focal length 28mm Speed 1:2.5 Minimum focus distance 0.5m Optical design (elements/groups) 9/7 Filter thread size 55mm Weight 350g Introduced 1973 This is the last of the 3 incarnations of the 28/2.5. My sample suffers from yellowing well-known for this lens type, even though it's the most recent version. Picture gallery 60

MC W.Rokkor-X SI 28mm 1:2.5 Focal length 28mm Speed 1:2.5 Minimum focus distance 0.5m Optical design (elements/groups) 9/7 Filter thread size 55mm Weight 350g Introduced 1973 American version of the last MC 28/2.5 variant Picture gallery 62

MC W.Rokkor 28mm 1:2.8 Focal length 28mm Speed 1:2.8 Minimum focus distance 0.3m Optical design (elements/groups) 7/7 Filter thread size 55mm Weight 240g Introduced 1975 The successor to the 28mm 1:2.5, much smaller and lighter, but also 1/3 of a stop slower. No radio-active elements as well, so no yellowing. This is the earlier and heavier version of the MC W.Rokkor 2.8/28. Picture gallery 65

MC W.Rokkor 28mm 1:2.8 Focal length 28mm Speed 1:2.8 Minimum focus distance 0.3m Optical design (elements/groups) 7/7 Filter thread size 55mm Weight 205g Introduced 1975 Later and lighter version of the MC W.Rokkor 2.8/28 Picture gallery 70

MC W.Rokkor-X 28mm 1:2.8 Focal length 28mm Speed 1:2.8 Minimum focus distance 0.3m Optical design (elements/groups) 7/7 Filter thread size 55mm Weight 205g Introduced 1975 The American version of the lighter MC-X 2.8/28mm Picture gallery 75

MC Celtic 28mm 1:2.8 Focal length 28mm Speed 1:2.8 Minimum focus distance 0.3m Optical design (elements/groups) 7/7 Filter thread size 55mm Weight 240g Introduced 1975 The budget version of the MC W.Rokkor 28mm 1:2.8. Slightly sunken dot instead of raised dot and different patterns on the rubber focussing grip and aperture ring. Picture gallery 80

MD W.Rokkor 28mm 1:2.8 Focal length 28mm Speed 1:2.8 Minimum focus distance 0.3m Optical design (elements/groups) 7/7 Filter thread size 55mm Weight 205g Introduced 1977 The first MD version of the 2.8/28, the extra MD lug is the only significant change here. It kept the metal aperture ring. Picture gallery 90

MD W.Rokkor-X 28mm 1:2.8 Focal length 28mm Speed 1:2.8 Minimum focus distance 0.3m Optical design (elements/groups) 7/7 Filter thread size 55mm Weight 205g Introduced 1977 The American Rokkor-X version of the first MD 2.8/28. Picture gallery 95

MD Celtic 28mm 1:2.8 Focal length 28mm Speed 1:2.8 Minimum focus distance 0.3m Optical design (elements/groups) 7/7 Filter thread size 55mm Weight 205g Introduced 1977 The budget version of the previous model. I couldn't find data on it. I assume that the basic data are the same as those for the Rokkor equivalent. Picture gallery 100

MD W.Rokkor 28mm 1:2.8 Focal length 28mm Speed 1:2.8 Minimum focus distance 0.3m Optical design (elements/groups) 7/7 Filter thread size 49mm Weight 180g Introduced 1978 The more compact version with plastic aperture ring. Picture gallery 110

MD W.Rokkor 28mm 1:2.8 Focal length 28mm Speed 1:2.8 Minimum focus distance 0.3m Optical design (elements/groups) 7/7 Filter thread size 49mm Weight 180g Introduced 1978 Different cosmetics compared to the previous model, very similar to the Celtic 2.8/28 of the same era. Most obvious is the pattern on the rubber ring, but note also the recessed red dot instead of the raised dot and the yellow feet scale. It is generally believed among Minolta historians that this lens was actually produced by Minolta as opposed to a sort of hack where the Celtic front lens ring might have been replaced by a Rokkor one. Picture gallery 120

MD W.Rokkor-X 28mm 1:2.8 Focal length 28mm Speed 1:2.8 Minimum focus distance 0.3m Optical design (elements/groups) 7/7 Filter thread size 49mm Weight 180g Introduced 1978 The earlier American version with orange lettering Picture gallery 122

MD W.Rokkor-X 28mm 1:2.8 Focal length 28mm Speed 1:2.8 Minimum focus distance 0.3m Optical design (elements/groups) 7/7 Filter thread size 49mm Weight 180g Introduced 1978 The later American version with white lettering Picture gallery 125

MD Celtic 28mm 1:2.8 Focal length 28mm Speed 1:2.8 Minimum focus distance 0.3m Optical design (elements/groups) 7/7 Filter thread size 49mm Weight 180g Introduced 1978 The budget version of the MD-II 2.8/28mm lens Picture gallery 130

MD 28mm 1:2.8 Focal length 28mm Speed 1:2.8 Minimum focus distance 0.3m Optical design (elements/groups) 7/7 Filter thread size 49mm Weight 185g Introduced 1981 The plain MD version, this one very probably has the same optical design as its predecessors. Picture gallery 140

MD 28mm 1:2.8 Focal length 28mm Speed 1:2.8 Minimum focus distance 0.3m Optical design (elements/groups) 5/5 Filter thread size 49mm Weight 185g Introduced 1983 New optical design, recognizeable by the slightly different front ring design and the larger radius of the front element. Picture gallery 150

Auto W.Rokkor-SG 28mm 1:3.5 Focal length 28mm Speed 1:3.5 Minimum focus distance 0.6m Optical design (elements/groups) 7/7 Filter thread size 67mm Weight 345g Introduced 1963 Minolta's very first 28mm lens and the only one without meter coupling Picture gallery 160

MC W.Rokkor-SG 28mm 1:3.5 Focal length 28mm Speed 1:3.5 Minimum focus distance 0.6m Optical design (elements/groups) 7/7 Filter thread size 67mm Weight 350g Introduced 1966 The MC version of the 28mm, otherwise very similar to the Auto version Picture gallery 170

MC W.Rokkor-SG 28mm 1:3.5 Focal length 28mm Speed 1:3.5 Minimum focus distance 0.6m Optical design (elements/groups) 7/7 Filter thread size 55mm Weight 245g Introduced 1968 The second 28mm optical design, smaller, lighter and with a 55mm filter thread Picture gallery 180

MC W.Rokkor-SG 28mm 1:3.5 Focal length 28mm Speed 1:3.5 Minimum focus distance 0.6m Optical design (elements/groups) 7/7 Filter thread size 55mm Weight 260g Introduced 1969 Same optical design, but different cosmetics, notably the hills-and-dales focussing ring Picture gallery 190

MC W.Rokkor-SG 28mm 1:3.5 Focal length 28mm Speed 1:3.5 Minimum focus distance 0.6m Optical design (elements/groups) 7/7 Filter thread size 55mm Weight 260g Introduced 1973 Still the same optical design, but yet another cosmetic change. Note the rubber-clad focussing ring and the black aperture ring. Picture gallery 200

MC Celtic 28mm 1:3.5 Focal length 28mm Speed 1:3.5 Minimum focus distance 0.6m Optical design (elements/groups) 7/7 Filter thread size 55mm Weight 260g Introduced 1974 The same optical design as the previous model. Maybe the coatings are less sophisticated and the usual cosmetic differences between Rokkor and Celtic apply. Picture gallery 210

MC W.Rokkor 28mm 1:3.5 Focal length 28mm Speed 1:3.5 Minimum focus distance 0.3m Optical design (elements/groups) 5/5 Filter thread size 55mm Weight 220g Introduced 1975 A new and simpler optical design and also different styling. No letters anymore for the number of elements and groups and a combined diamond indicator for focus distance and aperture. Picture gallery 220

MD W.Rokkor 28mm 1:3.5 Focal length 28mm Speed 1:3.5 Minimum focus distance 0.3m Optical design (elements/groups) 5/5 Filter thread size 55mm Weight 195g Introduced 1977 The MD version. Most important feature is its extra lug on the aperture ring for signalling the minimum aperture, also note the different font types on front, focussing and aperture rings. Serial number disappeared from the front ring and is now engraved on the barrel. Picture gallery 230

MD W.Rokkor 28mm 1:3.5 Focal length 28mm Speed 1:3.5 Minimum focus distance 0.3m Optical design (elements/groups) 5/5 Filter thread size 49mm Weight 160g Introduced 1978 The second MD version has a 49mm filter thread size and plastic aperture ring. Picture gallery 240

MD 28mm 1:3.5 Focal length 28mm Speed 1:3.5 Minimum focus distance 0.3m Optical design (elements/groups) 5/5 Filter thread size 49mm Weight 170g Introduced 1981 The last version, the plain MD without Rokkor designation. Picture gallery 250

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