The depth of focus of medium magnification lens (SDS-M)

Let’s try to measure the depth of focus of our medium magnification lens (SDS – M).

＜1＞　 Lens medium magnification lens （SDS-M） Magnification 20x Object　 0.5mm pitch glass scale GS-0.5

If it is judged that the focus indicated by the red frame is in focus … 0.5 x 7 x 0.71 = 2.5 mm

＜2＞　 Lens medium magnification lens （SDS-M） Magnification 60x Object　 0.2mm pitch glass scale GS-0.2

If it is judged that the focus indicated by the red frame is in focus … 0.2×3 x 0.71 = 0.42 mm

 

＜3＞　 Lens medium magnification lens （SDS-M） Magnification 120x Object　 0.2mm pitch glass scale GS-0.2

If it is judged that the focus indicated by the red frame is in focus … 0.2 x 2 x 0.71 = 0.3 mm