Almicro Phase Contrast attachment is useful for viewing the detailed structures of unstained or living specimens. This is due to the unique ability of the phl1se contrast equipment to convert small differences in thickness and refractive index of the specimen into differences in ! brightness. The set consist of Phase turret condenser N.A. 1.25 with iris diaphragm. Phase achromatic objectives, 45mm Par focal distance 1 Ox(N.A. 0.25) 20x (N.A. 0.40), 40x (0.65) Spring loaded, 100x (N.A. 1.25) Spring loaded, Oil immersion, Phase centering telescope, Green filter & Turret condenser key. 52000.00 Dark Field Condenser and Phase Contrast Equipement can be attached to any Miccroscope.