Adjustable rate of Spherical Aberration

Several 85 mm focal length lenses have been produced by Minolta, Varisoft Rokkor 85 mm/2.8 has some outstanding situation among them, the performance of adjustable rate of the correction in Spherical aberration. Though there is a easy way to control it by inserting holed plate on the light source, Minolta's Varisoft lens is designed with different way, forming the adjusting lens module at the most posterior part of the construction, the module moves antero-posteriorly as long as 8 mm when adjusted actually. As the focusing performance and the change of aberration correction are completely some different phenomena, two types of helicoid construction are designed in tandem, this is why it has longer cylinder fuselage length. As the rate of Aspherical aberration drifts according to the iris opening condition, the distribution of correction should be done with the deeper consideration on the interactive relations, it requires most difficult and professional like keen observation at all, yes, it is so difficult as to make me enthusiastic emotionally. At that time, over half a century ago, the engineers in Minolta's researching and development had enthusiastic energy to make us excite ultimately. Now, we can see their efforts by utilizing Digital Imaging format so easily without employing exaggerated professional measuring devices and equipment, we are living now in the fantastic paradise world.