bright field illumination

bright field illumination

A method for lighting a specimen with a solid cone of light. Transmitted bright field illumination (BFI) requires a substage condenser; reflected BFI requires a vertical illuminator.
References in periodicals archive ?
Normal bright field illumination (light passing through the specimen) usually is best for pigment pastes and paint when looking for pigment aggregation, flocculation, and overly large particles.
All three photographs were taken with bright field illumination (light from below the specimen).