Checking of Wide and Standard Lens

• First you should look for any scratches on the front and rear glasses against the reflection of fluorescent lamp.



• Turn the focusing ring to see if it is smooth.
  
  
• Point the lens to a fluorescent lamp*, look throughthe lens from lens mount side, it should be clear, then try to focus your eyes to each lens inside to see if any scratches or dirt inside. A little fine dust should be okay in most cases.
  
  *Caution: don't point to high intensity point soure lamp, such as incandescent, halogen or compact fluorescent lamp as the strong light might hurt you eyes.
  
  
• Check the lens-release to see if it works then carefully mount the lens to a camera (use your own camera if possible, since you know your camera well) and look through the viewfinder to a distance object, focus the lens to see if the infinity mark aligned. Don't forget to check the image quality at the edges of your viewfinder. Focus your lens to close objects and check if the view is clear.
  
  
• Turn to minimum aperture, look from the lens front, release the shutter to see if the diaphragm works.