Exposure Adjusting

Discussion in 'Beyond the Basics' started by oriecat, Feb 3, 2004.

  1. oriecat

    oriecat work in progress

    Joined:
    Jul 7, 2003
    Messages:
    3,118
    Likes Received:
    19
    Location:
    Portland OR USA
    I know I should know this, or how to figure it out, but its one of the areas where I get all confused...

    Say I'm bulk loading film... I buy a roll of 1600 ISO. Now the canisters I have have the code for 400, or if I used a non-coded canister, then my Nikon defaults to 100. I don't want to pull the film, so how can I adjust the exposure so that it is actually exposed properly at 1600?
     
  2. mrsid99

    mrsid99 TPF Supporters Supporting Member

    Joined:
    Mar 8, 2003
    Messages:
    2,964
    Likes Received:
    5
    Location:
    Florida
    Now let's see....if it's 1600 film in 400 cans then we'll need four of them...but if the camera is defaulting to 100 then maybe it should be 16?
    But it could be only four again if it's 100 in 400 cans but then again.....?
     
  3. voodoocat

    voodoocat ))<>(( Supporting Member

    Joined:
    May 15, 2003
    Messages:
    5,277
    Likes Received:
    17
    Location:
    Gilbert, AZ
    Can others edit my Photos:
    Photos NOT OK to edit
    400 is 2 stops, 100 is another 2 stops, so 4 in all.
     
  4. ksmattfish

    ksmattfish Now 100% DC - not as cool as I once was, but still

    Joined:
    Aug 25, 2003
    Messages:
    7,021
    Likes Received:
    34
    Location:
    Lawrence, KS
    Can others edit my Photos:
    Photos NOT OK to edit
    If you have ISO 1600 film and you want to shoot it at 1600:

    camera set to ISO 400: under expose by 2 stops

    camera set to ISO 100: under expose by 4 stops
     
  5. oriecat

    oriecat work in progress

    Joined:
    Jul 7, 2003
    Messages:
    3,118
    Likes Received:
    19
    Location:
    Portland OR USA
    Thanks guys!!
     
  6. Jeff Canes

    Jeff Canes No longer a newbie, moving up!

    Joined:
    May 19, 2003
    Messages:
    6,190
    Likes Received:
    22
    Location:
    Hollywood, FLA USA
    Can others edit my Photos:
    Photos OK to edit
    No way to set the ISO manually:?:
     
  7. oriecat

    oriecat work in progress

    Joined:
    Jul 7, 2003
    Messages:
    3,118
    Likes Received:
    19
    Location:
    Portland OR USA
    Nope. :( It reads the code or it defaults to 100...
     
  8. havoc

    havoc Jedi something or other

    Joined:
    Aug 23, 2003
    Messages:
    1,093
    Likes Received:
    4
    Location:
    Portland Oregon, USA
    Lame ass Nikon's My sheep are trained to stampede any Nikon camera's they come in contact with..... Now if only i can train them to leave the owner alone....
     
  9. zio

    zio TPF Noob!

    Joined:
    Dec 22, 2003
    Messages:
    107
    Likes Received:
    0
    Location:
    cb2 2bp
    i was playing with my canon today and i can change the ISO if i want...so what does that do?
     
  10. voodoocat

    voodoocat ))<>(( Supporting Member

    Joined:
    May 15, 2003
    Messages:
    5,277
    Likes Received:
    17
    Location:
    Gilbert, AZ
    Can others edit my Photos:
    Photos NOT OK to edit
    It's so the meter in the camera knows how to expose the film propely. If you want to change how the film is rated. Say you are shooting with Velvia rated at ISO50. Most people like to overexpose by a 1/3 of a stop and shoot at ISO40. You would then manually set this on the camera.

    The cheaper SLR's leave that option off for some stupid reason. I don't know about Canon, but with Nikon you cannot change it manually unless it is an N90 and higher.
     
  11. Josh

    Josh TPF Noob!

    Joined:
    Jan 28, 2004
    Messages:
    44
    Likes Received:
    0
    to keep from getting confused, f-stops go by dubbling and film speeds tend to fallow.


    50, 100, 200, 400, 800, 1600, 3200

    count the stops and shoot like mad baby!
     
  12. ksmattfish

    ksmattfish Now 100% DC - not as cool as I once was, but still

    Joined:
    Aug 25, 2003
    Messages:
    7,021
    Likes Received:
    34
    Location:
    Lawrence, KS
    Can others edit my Photos:
    Photos NOT OK to edit
    Shutter speeds and film speed go by doubling or halfing for each stop, but there is a different pattern for f/stops:

    1, 1.4, 2, 2.8, 4, 5.6, 8, 11, 16, 22, 32, 45, 64....

    Each of the f/stops above are 1 stop, but notice every other one is doubled.
     

Share This Page