Can a planachromat objective be useable in reflected light fluorescence?
The answer is a provisional yes. Planachromats may serve satisfactorily for blue or green excitation waves lengths. However, the planachromat’s glass elements may themselves fluoresce in excitation in the near ultraviolet. Also, planachromats, for their respective magnifications, have lower N.A.’s than do planfluorites or planapochromats-thus the images may be not as bright.
