Microscope Eyepiece - LOMO Homal-4

Homal is a special projecting system used to take pictures in the visible light. Optical system of homals partially corrects field of view curvature and magnification chromatic aberrations of achromatic and apochromatic objectives. But using homals you lose about 1/3 of the field of view.

This Homal-IV should be used with objectives for 160mm and 190mm tube length if their powers is 60x or higher, and with 90x infinity tube objectives (using f=250mm tube lens).

Focal length - minus 20.28mm;
Linear field of view - 8mm;
Mount diameter - 27mm;
Coated glass.

Very good used condition.