... -coated,mildewproof and anti-reflective.Specifications: Eyepiece Magnification 12.5×Objective Lensf=200Working Distance190mmMagnifications for Main Microscope5.3×,8×,12×Diameter ... :f250mm,f300mm,f350mm,f400mm(12.5X eyepiece). Big Objective LensDiameter of Field(mm)f250mmφ47.5, φ31, φ21f300mmφ57, φ38, φ25f350mmφ67 ...