Archived posting to the Leica Users Group, 2004/11/04
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]On 11/3/04 11:31 PM, "Frank Dernie" <Frank.Dernie@btinternet.com> typed: > Due to the wavelength dependancy of refraction lenses do not focus all > colours in the same plane at once. Acromats are corrected such that two > colours are in focus in the same plane at once, apocromats are > corrected such that 3 colours are in focus at the same plane at once. > Other wavelengths are not in focus causing colour fringing and lack of > sharpness. The extent to which the other colours are OOF is lens design > dependant. Apo lenses should be sharper than non apo. > Frank > And super acromats like on the Hasselblad? What does THAT mean? Must be all three wavelengths of light in line with FM Radio. Mark Rabiner Photography Portland Oregon http://rabinergroup.com/