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Canon EOS Digital Rebel problem

Discussion in 'Digital Photography & Imaging' started by computerwiz5, Jan 30, 2005.

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  1. computerwiz5

    computerwiz5 Thread Starter

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    I am having a dilemma with my Canon EOS Digital Rebel. The 3 problems I am facing is the shadow behind the finial, and the focus. There are a lot of manual and automatic modes but I don’t know which one to set it on. Right now I have the mode set to portrait. I have been messing around with the aperture and iso speed. I have the finial on a white surface. When ever I take the picture I get a gray background and the light source is day light and halogen, I have tried both. The shadow is coming from the flash, so I don’t know what mode it should be on.

    Thanks
    Danny

    [​IMG]
     
  2. etaf

    etaf Moderator

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    well theres a lot of questions there and a number of answers -

    so first
    exposure
    the camera is set to expose at a average gray tone - so it will try and make the white gray - same happens on snow.....

    so you need to allow a bit more light in
    now as you are using flash theres a number of ways to do that.
    1) over exposure setting in camera
    2) over exposure setting on flash

    focus
    how close is the subject at what lens are you using

    i suspect you need a macro lens as you are to close for the subject
    or you have the speed set to slow and getting camera shake

    shadow
    bounce the flash
    or
    use a white card at the side to bounce light back into shadow
     
  3. buck52

    buck52 Banned

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    Good suggestions by etaf...

    first thing I would try is skip the flash ..use a tripod... shut the focus assit light off and use the timer delay...meter on the darker area and use about -1/3 exposure...

    Not sure how that will do with that camera but experiment till it does not blow the highlights in the histogram

    If you must use the flash then it needs to be bounced or you need a fill flash from the back

    edit... wanted to add...use manual focus

    buck
     
  4. computerwiz5

    computerwiz5 Thread Starter

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    Thanks for the tips guys but, how can i bounce the flash?
     
  5. buck52

    buck52 Banned

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    If your using built in flash it's difficult for what you are trying to do that's why I suggested no flash and a longer exposure time on a tripod...

    you could try a bright light aimed at bounce card or white sheet to light the back of the subject
     
  6. etaf

    etaf Moderator

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    put the object next to a window - so you get some natural light.
    say you get a reading of
    1/60th @ F8
    then you need to let more light in - in order to make the white white and not gray
    try increasing by 1/2 stops upto 2 or 3 stops over exposed- (BTW also called bracket where the camera does it automatically)
    1/60th @ f5.6 is 1 stop more light

    also play by putting some white card around to bounce the light back into the object
    also try a black card on that image you will get quite an effect around the glass
     
  7. computerwiz5

    computerwiz5 Thread Starter

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    ill try that but i dont know what those terms mean, F8, stops, 1/60 of what? I am so confused

    Thanks
     
  8. buck52

    buck52 Banned

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    don't use the flash...

    if you have a tripod use it and set the camera to timer...press the button half way till the focus beeps then all the way and get away...let the camera do it's thing
     
  9. etaf

    etaf Moderator

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    no problem
    you may want to have a look at some photography tutorials
    some are own
    www.photo.net
    http://www.dpforums.com/

    otherwise search the web
    get some magazines etc

    so let me try and explain a little

    the aperture F - is the size of the hole in the lens which you adjust. depending on lens depends on the largest hole available
    the number is a ratio - but we will not worry about that

    so F2.8 is a big hole lets lot of light in - F16 is a small hole and lets less light in

    F4 lets half as much light as F2.8
    F5.6 half as F4
    F8 half as F5.6
    etc
    etc
    twice/half as much light is called a stop - hence 2 Fstop's = change from say 2.8 t0 4 to 5.6

    Now the speed - this is the time the shutter is open to allow light to fall onto the sensor or film.

    1/60th = 1/60th of a second

    1/125th lets in half as much light

    so
    1/60 - 1/125 - 1/250 - 1/500

    so thats how we control the light to expose the film

    so if the exact amount of light needed is 1/60 @ f8
    thats open the hole which is F8 size for 1/60th of a second

    thats assumes the scene you are photgraphing is average gray -
    but white needs more light in
    so allow more light in by
    1) changing the size of hole
    or
    2) the time the light is allowed on the sensor

    have a read here
    http://shutterbee.thinkrandom.com/
    http://www.photoxels.com/tutorial_aperture.html
    http://people.clarkson.edu/clubs/cupc/cameratutorial.html
    http://www.howstuffworks.com/digital-camera2.htm
    http://www.homestead.com/image_master/digitalcameratips.html
     
  10. etaf

    etaf Moderator

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  11. etaf

    etaf Moderator

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