formats and continued to sell it. Unexposed Technical Pan is now quite valuable. Tech Pan or Technipan, as it is often known, was very popular among some professional photographers and astronomers, as it is capable of recording extremely fine detail, and its sensitivity curve extended much further into the red than most films. In particular, it was very sensitive to light emitted by hydrogen at 656.28 nm (H-alpha), which made it very useful for a wide range of astronomical imaging. Tech Pan was also useful for electron and laser photography. The film was popular with photographers in the art and fashion industries for its extremely high-contrast results when up-rated and processed in an abrasive, high-strength developer. This description comes from Kodak publication No. P-255, copyright 1985: References Kodak photographic films