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

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 previous lens Picture gallery

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

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

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

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. Picture gallery

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

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 240g Introduced 1977 The first MD version of the 28/2.8, the extra MD lug is the only significant change here. It kept the metal aperture ring. Picture gallery

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 240g 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

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

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. 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. Picture gallery

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 This model, the budget version, shows a striking resemblance to the previous Rokkor model. Picture gallery

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

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

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

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

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

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

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

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

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, als 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

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

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

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