c2467fbd_and_Lens_Alignment___TRIOPTICS__Transmission
[Measurement] Single lens on vacuum device [Reflection] + Approx. two times accuracy of transmission measurement + Direct measurement of surface tilt error [Transmission] 
+ Less sensitive to vibrations + Easy to find image (intensity) - Calculation required to get correct surface tilt error.
Optical Centration Measurement and Lens Alignment - TRIOPTICS
Transmission