Found this thread from nearly a decade ago in cloudynights message board: https://www.cloudynights.com/topic/484005-diffractive-optics-applied-to-eyepiece-desig

Found this thread from nearly a decade ago in cloudynights message board: https://www.cloudynights.com/topic/484005-diffractive-optics-applied-to-eyepiece-design/ https://www.cloudynights.com/topic/484005-diffractive-optics... So far there hasn't been a telescope brought to market with this type of lens that is able to achieve apochromatic status. Apparently there's quite a few issues with off axis chromatic aberrations. That'd be a huge negative for a scientific telescope.