Switch to English Language Passer en langue française Omschakelen naar Nederlandse Taal Wechseln Sie zu deutschen Sprache Passa alla lingua italiana
Members: 70,568   Posts: 1,545,439   Online: 1081
      
Page 2 of 2 FirstFirst 12
Results 11 to 13 of 13
  1. #11

    Join Date
    Jul 2007
    Location
    Netherlands
    Shooter
    Medium Format
    Posts
    5,686
    Quote Originally Posted by Chan Tran View Post
    To test the flash with an incident meter you would need to point it at a gray card.
    You just need to slide the dome aside and point the meter at whatever the sensor in the flash unit is seeing. No matter what that is: pitch black, gray, purple with yellow stripes, or white.

  2. #12
    eddym's Avatar
    Join Date
    Jan 2006
    Location
    Puerto Rico
    Shooter
    Multi Format
    Posts
    1,927
    Images
    26
    What is the purpose of your test?
    Are you trying to determine the strength of your flash? If so, then you need to set it on manual, not auto.
    Or are you trying to determine the accuracy of the auto flash sensor? If so, then you need to take the reflected reading as others have mentioned.
    The strength of your flash is good to know; the accuracy of the flash's auto sensor depends on the subject it is reading. Both are important in the real world, but for different purposes.

    On the other hand, if you are not really testing, but trying to take a picture, then take an incident reading with your flash meter and go with it. Then you don't care what the background is, whether you are in auto or not; your meter tells you what the exposure will be.
    Eddy McDonald
    www.fotoartes.com
    Eschew defenestration!

  3. #13

    Join Date
    Nov 2005
    Location
    Los Angeles, CA
    Shooter
    Multi Format
    Posts
    5,069
    Quote Originally Posted by eddym View Post
    Or are you trying to determine the accuracy of the auto flash sensor? If so, then you need to take the reflected reading as others have mentioned.
    The best way I've found for "testing" the accuracy of autoflash sensor is to shoot a roll of slide film in a controlled manner. Shoot pics of scenes at the extremes of the auto sensor range (if the range is 10 ft to 45 feet, shoot a scene 10 feet away and another 45 feet away and maybe one in between) and see if they are adequately illuminated.

Page 2 of 2 FirstFirst 12


 

APUG PARTNERS EQUALLY FUNDING OUR COMMUNITY:



Contact Us  |  Support Us!  |  Advertise  |  Site Terms  |  Archive  —   Search  |  Mobile Device Access  |  RSS  |  Facebook  |  Linkedin