digital magnifier

Hello, We are looking for Freelancer having knowledge of optics. We want to make a digital magnifier on the property of the compound microscope. These are some parameters - Object distance is - 1.2cm Distance between 2 convex lenses 1.3cm Optical (image sensor) is just near the eyepiece We need the full specification of both the lens and min 400x magnification and lens specified lens should be avelable easily in the market. We are using - Camera: OV2640 Camera Resolution: 2Megapixel