What types of lenses are employed in a Huygenian eyepiece?
What types of lenses are employed in a Huygenian eyepiece? Huygenian eyepiece One of the earliest compounds lenses, introduced by Christiaan Huygens in 1664. It uses two plano-convex lenses, both mounted with the convex surface toward the objective. Huygenians offer good eye relief but suffer badly from spherical aberration and various other defects. What is […]