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 CD drive is an optical drive (a piece of hardware that reads Compact Discs). A DVD drive is an optical drive (a piece of hardware that reads DVD Discs). There are lots o â¦ f optical drives that can read both DVDs and CDs, some can even 'burn' information onto blank discs. ___________________ From: TheAllKnowingEye.