The 0.35X eyepiece lens can fit with the below lens:

 1: http://www.ioioa.com/Show.aspx?PID=9

 2: http://www.ioioa.com/Show.aspx?PID=5

 After replaced the new eyepiece lens, you can get a new lens with new magnification

Features:

 Material: Metal

 C-mount threads for C-mount Digital Camera

 Magnifier Power: 0.35X

 Dia of Lens bottom: 28mm

 for 28mm-32mm Microscope  Eye tube (including 30mm, 30.5mm, you can add diameter by tape)

Package Including: 

 1 x eyepiece lens