Back in the days of 35mm film, a 50mm prime was considered a 'standard' lens. That's because it gives pretty much the same perspective as viewing a scene with the human eye, without the magnification of a telephoto lens or the shrinkage a wide-angle lens uses to squeeze more into the frame.
The flexi disc (also known as a phonosheet or Soundsheet, a trademark) is a phonograph record made of a thin, flexible vinyl sheet with a molded-in spiral stylus groove, and is designed to be playable on a normal phonograph turntable.
A posterior bulging disc is a medical term for an intervertebral disc that has bulged toward the âposterior,â or back, of the spinal column.Posterior bulging discs are relatively common, as abnormal disc bulges tend to occur when people are bending forward. posterior bulging disc can be located in any segment of the spinal column that has discs. For instance: 1  A cervical bulging disc would be located in the neck area, or cervical region.