When we remove the lens to measure the surface area to sample checks, see resolution (by instrumentation OM) in which the value of the resolution of the surface area of the sample, there are clearly differences in lens.
When we took a sample lens to measure the surface area to check the resolution (without instrumentation. OM) is the definition of the surface area of the sample lens is a clear distinction.
When we get to the temple sample lens surface area to check the resolution (by a measuring instrument OM) which the value of the resolution of the surface area of the sample lens is different obviously.