| Author | Message | ||
     Cyberjunkie Tinkerer Username: Cyberjunkie Post Number: 2 Registered: 07-2010 Rating: N/A |
I am trying to guess how a makeshift collimator could be used for checking the correct performance of a certain lens. Expecially with large format cameras/lenses, shooting pictures to check for image quality can be expensive (vey expensive if you shoot 8x10"). Using a home-made collimator to visually check for aberrations would be easier and quicker. Sometimes very old lenses were improperly reassembled, or a DIY re-cementing project can produce a misaligned group. Finding a solution would be a little easier with an optical test bench available at home! My best guess would be to use a ground glass, with five crosshairs, etched in the center and close to the four corners, to check for the consistency of the plane of focus. If there is something else that could be done, please explain. I am sure that it would be of some interest for many forum readers. have fun CJ |