flat-field achromatic objective lens
objective lens of the scanning electron microscope
I'm also somewhat mystified at Pentax's failure to provide lens caps for the objective lenses.
Solipsism is basically what you get when you try to interpret subjective reality through an objective lens.
So this is very, very low-cost to buy, and actually, the objective lens in the microscope, the very powerful lens we use to image the atoms, is also from a CD player.
When I view reality through the objective lens, my standard of accuracy is how well I can predict what's going to happen.
Accurate measurement of geometrical distortion of image display system with wide-angle objective lens is the precondition and key of digital distortion correction.
