Some microscopes come equipped with a so-called daylight blue filter. What is this used (or misused) for?
The “daylight blue” filter is a filter for observation only. It furnishes a pleasant pale blue-gray background to the field of view. It is NOT meant for photomicrography with daylight color film. Such film requires a blue conversion filter such as the Olympus LBD or Kodak 80A filter. The conversion filter boosts the color temperature of the light source, thus simulating light of daylight color temperature quality (5500 degrees Kelvin) required for daylight balanced color film.
