exposure question

Discussion in 'Film Discussion and Q & A' started by spiffybeth, Apr 14, 2008.

  1. spiffybeth

    spiffybeth TPF Noob!

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    tonight ill be shooting in a very low light environment (a bar). last time i shot it, i was shooting digital so i could adjust my settings as i saw fit, but this time id like to shoot film.

    the settings i had it on was iso 1600, f/3.5-5.6 18-55mm (kit lens) and i set the shutter for 1/30.

    this time, im going to be using film. iso 400 and a 50mm f/1.7. what should my shutter be to keep that same exposure?

    what about if i shot at f/2.8?
     
  2. Battou

    Battou No longer a newbie, moving up!

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    that ain't gonna cut it I don't think.

    My self I would be using 800 and 1.4 (in your case 1.7) and keeping the shutter as fast as possible.


    But not knowing the exact light situation I can't be sure if that is too much or too little....this is one of those things one has to be there and read them selves to give the best advice.
     
  3. spiffybeth

    spiffybeth TPF Noob!

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    ok, lets say i had iso800 and the lighting was the same as the first scenario. what then?
     
  4. Battou

    Battou No longer a newbie, moving up!

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    You'll have to jog my memory
     
  5. spiffybeth

    spiffybeth TPF Noob!

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    see the first post.

    there must be an equation i can solve to find the answer, right????????
     
  6. Battou

    Battou No longer a newbie, moving up!

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    I am horrible with equations, I was hoping for a link to the afore mentioned outing so I could see it.
     
  7. Steph

    Steph No longer a newbie, moving up!

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    What aperture did you use when you shot the scene with your digital camera?
     
  8. KevinDks

    KevinDks TPF Noob!

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    Well, f/2.8 is two thirds of a stop faster than f/3.5, so if 1/30th at f/3.5 was OK at ISO 1600 then f/2.8 at 1/30th will be a third of a stop under that exposure at ISO 800. With negative film that shouldn't be a problem, but I think I'd make sure I had a mixture of shots that included some with a bit more exposure as well.
     
  9. spiffybeth

    spiffybeth TPF Noob!

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    f/3.5 and f/5.6
     
  10. spiffybeth

    spiffybeth TPF Noob!

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    and if i went with f/1.7, at 1/30, that should be ok?
     
  11. KevinDks

    KevinDks TPF Noob!

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    f/1.7 is another stop and a half faster than f/2.8 and so, let's see if I can keep track here, err - about two thirds of a stop to a stop more exposure than you had with your digital at f/3.5 and 1/30th I think. Bracket between those kinds of settings and the latitude in negative film will take care of the rest.

    This wiki page has useful tables which set out the f/ number sequence in half and third stops

    This web page has a chart that gives you a rule of thumb exposure guide for all kinds of situations, and equivalent exposures.

    Kevin
     
  12. spiffybeth

    spiffybeth TPF Noob!

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    thank you very much, kevin!!!!!
     

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