uniQoptics

 
There are two versions of the Micrometer Diascope, and three mounting platforms. It is a simple tool to adjust back focus, but it should only be used by an experienced lens technician because of the delicacy and importance of flange distance. Please select which focal length you would prefer below, or view the flyer handout.

 MD-22

  For all information regarding the Micrometer DIascope Checker Select below:

MD Checker

If you bought a respectable digital camera/lens and it does not properly match its footage scale or tape measurement, whether your equipment is new or used, you can still find clarity. Common usage, changing whether, and many other factors are always throwing off back focus by the slightest amount. With experienced technicians and end users agreeing on the problems, we have devised a system to get right down to the core of the situation. But first, please follow the steps below accordingly to solve your issue. Each step is listed by relevance to the solution.

Camera and Lens Check Procedure:

• Check the flange of your digital camera (Back Focus)
  • If the camera flange (that is the distance from the sensor to the front of the camera mount) is not within 0.0005" accuracy, zoom lenses will not stay in focus, and primes will have improper footage scales.
  • The most effective method of permanently correcting the problem would be to place the correct amount shims behind the camera mount, therein correcting the offset.
    
  • The second option in the case of a 52mm Arri Standard digital camera is trial and error with an instrument to determine accuracy.
  • The most accurate methods available to date are the Micrometer Diascopes seen below which measure this distance down to 0.0005", and the Precision Diascopes seen above. Please read more about the Micrometer Diascope below.
• Check your lens and mount type for its correct flange setting
  • Lenses generally come set correctly, but wear and tear may have thrown off the back focus of the lens. A worn lens will also introduce backlash, which will further reduce back focus accuracy.
  • An infinity collimator is the best method to ensure the correct setting of a lens. There are several options available, but few at affordable prices.
    
  • The uniQoptics collimator was originally designed as a Micrometer Diascope Checker, but it doubles as a collimator and proves itself with a 10X microscope objective and 14.5mm eyepiece. Please read more about the Checker/Collimator below.

Note: The most common method of adjusting camera back focus as been by the use of a known good lens. However, this method is simply not accurate enough. A uniQoptics Diascope is superior because it works as a type of microscope which allows for fine adjustment in this delicate procedure.