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.
Bulging Disc Overview. The bones in your spine are called vertebrae, and the soft cushion in between the vertebrae is called an intervertebral disc. The disc is made of a soft center surrounded by a tough outer shell. As we get older or strain the disc, through improper posture or injury, the discâs shell may weaken and lose its shape, causing the disc to bulge into the spinal canal. The result is a bulging disc.