I can recommend John Titterington for service on the Minolta SRT and X-700 cameras. There is a rokkorfiles website which will explain the differences between the different series of Minolta manual focus lenses. Beginning with the original SRT 101 of 1966 is the first series of MC (meter coupled) Rokkor lenses. With the exception of the standard lenses, the aperture rings were toward the center (from front to back) of the lens. In about 1970 the aperture ring was moved to the back of the lens. These were still called MC Rokkors and had metal focusing rings. In 1973 the MC Rokkor-X lenses came out. These all had rubber covered focusing rings and improved coating. In 1977, to go along with the XD-11 camera, which had both Aperture Priority and Shutter Priority automation, the MD Rokkor-X line came out. The MD lenses have two meter coupling tabs. Your SRT Super will not make any use of the MD (minimum diameter) tab. After the MD Rokkor-X series came the plain MD series. There was what is referred to as the MDIII series at the end. These are kit lenses which have Minolta markings but which were made by a different company, Cosina I think. The MDIII lenses are not very highly regarded. The XD series of cameras was only made for a few years. The cameras were expensive to make and the market was changing. The were succeeded by other X cameras. The XG cameras were pleasant to use when they worked but they were made to a price and were not terribly reliable. The X-700 succeeded these and remained in production from 1981 until almost 2000. The X-700 made use of the MD tab for it's Program mode. Minolta took the best features of the XD cameras and the X-700 and incorporated them into the Maxxum 7000 of 1985, the first mass produced integrated Auto Focusing SLR camera. The rest, as they say, is history. What is remarkable to me is how long the X-700 and the Maxxum 7000 overlapped. In the early AF years, people in other countries could not all afford AF SLRs yet. I have a fleet of X-700 cameras and have used them a lot over the years. For now, when it comes to Minolta, I am in more of an SRT Super phase.