Negative ISO

Discussion in 'Photography Beginners' Forum' started by robdavis305, Nov 25, 2009.

  1. robdavis305

    robdavis305 TPF Noob!

    Joined:
    Aug 29, 2009
    Messages:
    205
    Likes Received:
    0
    Location:
    Knoxville,Tn
    Can others edit my Photos:
    Photos OK to edit
    I have a Nikon D90 and was noticing that below 200 iso it goes into negative numbers. I usually try to keep it on 200-400 but was really curious on what the negative numbers mean. I am aware that when you crank it up enough it goes into positive. Thanks and Happy Thanksgiving !!!!!!!!
     
  2. Goontz

    Goontz TPF Noob!

    Joined:
    Jul 17, 2009
    Messages:
    1,275
    Likes Received:
    2
    Location:
    Austin/Houston, TX
    Can others edit my Photos:
    Photos OK to edit
    It's not that it's negative ISO, just values lower than 200, the lowest being 100. I forget the 2 other values that are between 100 and 200, but you can find them in the manual.
     
  3. Derrel

    Derrel Mr. Rain Cloud

    Joined:
    Jul 23, 2009
    Messages:
    35,456
    Likes Received:
    12,795
    Location:
    USA
    Can others edit my Photos:
    Photos OK to edit
    On the D90 Lo - 1 means the camera's gain control is set to a value that is approximately 1 full exposure value below the sensor's baseline ISO setting, which is ISO 200. The values in Nikon's "Lo" and "Hi" setting are part of what is called ISO Expansion. The values are not strictly calibrated, and do not necessarily reflect compliance with ISO standards. The D90's lowest,normal, actual, calibrated ISO-compliant setting is 200.

    A lot of cameras offer ISO Expansion; some only on the high end, some on both ends, high and low. On the lower end, there is often a reduction in dynamic range,and often time the highlights will block up a bit earlier than they would if the baseline ISO were used.
     
  4. DScience

    DScience No longer a newbie, moving up!

    Joined:
    Apr 12, 2009
    Messages:
    1,513
    Likes Received:
    122
    Location:
    Denver, CO
    Can others edit my Photos:
    Photos NOT OK to edit

    OH SNAP!!

    Dang it, i've been shooting in ISO LO (ISO 100) forever! Should I keep it at 200?
     
  5. musicaleCA

    musicaleCA TPF Noob!

    Joined:
    May 23, 2009
    Messages:
    2,303
    Likes Received:
    0
    Location:
    Vancouver, BC
    Can others edit my Photos:
    Photos OK to edit
    If you want the dynamic range back, yes.
     

Share This Page

Search tags for this page
can i have a negative iso
,
d90 iso expansion
,
iso calibration d90
,
iso negative
,
negative integers in photography
,

negative iso

,
negative iso camera
,
nikon d90 iso expansion