Lighting Problems

Discussion in 'Beyond the Basics' started by silver163, Mar 31, 2007.

  1. silver163

    silver163 TPF Noob!

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    Does anyone have any idea how I can avoid having such pictures? I got a K100D Pentax. I have F32, and I got the shutter speed at .3 and 1/8 seconds (different pictures), while I need to keep these speeds is there anyway to get the pictures much darker?

    here are some examples:

    http://i5.tinypic.com/2rgcoqx.jpg
    http://i3.tinypic.com/4cwco47.jpg
     
  2. gmarquez

    gmarquez TPF Noob!

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    I know exactly what you are going through. Get a good ND (Neutral Density) filter or two...they will cut down the amount of light entering your camera without throwing the colors off, allowing you to get longer exposures in sunlight without blowing everything to heck.

    Mine should be coming any day now, and I'll be trying what you are doing, but with moving ocean water...
     
  3. silver163

    silver163 TPF Noob!

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  4. gmarquez

    gmarquez TPF Noob!

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    The higher the number, the less light they let through...kind of like a strength of subtraction.

    If I remember right, a +2 will reduce your exposure by 1 stop, a +4 will reduce your exposure by 2 stops, and +8 will reduce your exposure by 3 stops.

    What this translates to for your application is that (if memory serves) a +2 will allow you to expose at 1/2 the shutter speed, a +4 will allow you to expose at 1/4 the shutter speed, and a +8 will allow you to expose at 1/8 the shutter speed and still get the same exposure.

    So...in theory...

    If you were shooting a bright, sunny scene with a waterfall at 100 ISO and 1/100sec. shutter speed, a 2x would allow you to go to 1/50sec. shutter speed, a 4x would allow you to go to 1/25sec. shutter speed, and an 8x would allow you to go to 1/12sec. shutter speed (or closest equivelent) with the same aperture.

    Dialing the aperture smaller can get you even longer exposures, because smaller apertures let in less light.

    (Someone let me know if I'm getting this wrong, I'm still relatively new to digital SLRs)
     
  5. RacePhoto

    RacePhoto TPF Noob!

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    Are you setting the camera to manual and the ISO to 200, which is the lowest for this camera?

    Just guessing from the subject of the photo, it seems like you could get by with a +4 ND and still be able to use it for other projects. If you get a +8 it might be too much to be useful, except for some special situations.


    Are you shooting full manual? You should be.
     
  6. Ken_D

    Ken_D TPF Noob!

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    What ISO are you using?
     
  7. Garbz

    Garbz No longer a newbie, moving up!

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    WOW the EXIF data on those images says your ISO is at 1600. You will want to cut that down to 100 for those shots. Also avoid High ISOs if possible as it introduces noise onto the sensor. Same square rule applies.
     
  8. silver163

    silver163 TPF Noob!

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    my iso was 800 when it was taken. my camera only allows me to go down to 200 iso
     
  9. fmw

    fmw No longer a newbie, moving up!

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    Going from 800 to 200 will reduce the exposure by 2 stops. That should be nearly enough to get your image exposed properly. If you need a little more, then the ND filter would handle that. You might also experiment with the shutter speed a little. You might find that 1/15 or 1/30 might also give you the look of motion in the water you seek.
     

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