ISO and my new Digital Rebel. :(

Discussion in 'Beyond the Basics' started by imakefights, Dec 22, 2004.

  1. imakefights

    imakefights TPF Noob!

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    I photograph boxing often. And to do so succesfully you need a camera that can shoot in poor lighting without a flash with a high shutter speed. So I chose the digital rebel based on its maximum ISO setting of 1600.

    Using the stock 18-55 lens with the lens fully open I took the pic below at 1/500 1600 ISO. And the result was very dissapointing. I then took my old Canon Powershot and took the same pic at 1/500 400 ISO and the results were virtually identical. Can anyone tell me what am I doing wrong? Did I just waste $800?

    Thanks
    [​IMG]
     
  2. Bokeh

    Bokeh TPF Noob!

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    We shoot in very similar conditions...

    Well, just as important, you need a really fast lense.

    When I shoot events that use a boxing ring and simliar lighting, I shoot with a Canon 50mm 1.4. This was recommended to me by a pro I talked to who shoots a lot of boxing events here in TeXa$. It was definitely, definitely the lense to get. I shoot all indoor sports with that lense, assuming the focal length is appropriate.
     
  3. oriecat

    oriecat work in progress

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    How was the aperture set?
     
  4. imakefights

    imakefights TPF Noob!

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    Aperature was 4.5.
     
  5. Big Mike

    Big Mike I am Big, I am Mike Staff Member Supporting Member

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    Welcome to the site,

    First of all, it appears you have a bright light and a dark hall-way. It looks like the exposure metering is set to matrix so both cameras are trying to get an average exposure of the scene. A better test would be a scene that did not have a bright light in it.

    I don't think you will get more exposure latitude with either camera...film is still king here. What you do get with the Rebel is clearer images with less noise. It's hard to tell but it looks like the power shot has more noise at ISO 400 than the Rebel has at ISO 1600...that's a pretty big advantage.

    As mentioned, a faster lens will be a huge help when shooting boxing. A lens that will open up to F1.4 would be ideal but you can usually get an F1.8 for 1/3 or 1/4 of the price. That's the biggest advantage the rebel has...you can upgrade to any of Canon's EF lenses.
     
  6. imakefights

    imakefights TPF Noob!

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    I guess the lens makes all the difference but I am still a little shocked by the fact I am getting no better results at 1600 than a far "inferior" camera gets at 400 regardless of the lens. I notice no more noise in the Powershot photo than in the Rebel photo. I reduced their size so the page would load faster but at full resolution the only difference is the white balance.

    How much difference will I notice between a 50 1.3 and a 50 1.8?

    Thanks
    Bobby
     
  7. voodoocat

    voodoocat ))<>(( Supporting Member

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    Your "results" are underexposed. Doesn't matter if you use a $10 disposable camera or a $5,000 Leica... if you don't expose the film or sensor, the results are going to be poor.

    You need a faster lens. 1.8 is a stop slower than a 1.4 lens.
     
  8. Big Mike

    Big Mike I am Big, I am Mike Staff Member Supporting Member

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    The difference between F1.4 &amp; F1.8 is one stop. So you can increase your shutter speed by one stop (twice as fast) or you could lower your ISO by one stop.

    I still think your test scene is not a good indicator. Try testing by shooting a solid color like a wall or a even a news paper page to see the resolution difference.

    Another huge difference, especially in boxing is the shutter lag. How fast does the Powershot take the picture after you press the button? How fast does the Rebel? It would probably be very difficult to shoot fast action, when timing really counts, with any p&amp;s digital camera.

    You could always take both cameras to a match and see if the Powershot will work for you. If it does, then take your Rebel back. I'm guessing that you would find the Rebel to be much better when you are actually shooting a match.
     
  9. BernieSC

    BernieSC TPF Noob!

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    how many different shutter speeds did you shoot at? You only mention 500th of a second did you try 250 or even 125th? but leave the aperture set at 4.5. I assume since its a zoom 4.5 is the fastest aperture.
     
  10. hlasso

    hlasso TPF Noob!

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    You can see in the images that the light source at the top right corner is making the metering system underexpose the other areas of the pictures.
    You should try with a less contrasted area (all subjects illuminated by approx. the same intensity) such as a wall. As the others have told you, a faster lens might be what you're looking for.

    Regarding the shutter lag, the Rebel will give you up to 2.5 fps if you use a fast shooting speed (1/250 and faster). According to specs in the manual you can shoot up to 4 shots in bursts... My experience has shown that the Rebel is really slow when recording the images to the CF card, especially when using RAW format.
     
  11. DocFrankenstein

    DocFrankenstein Clinically Insane?

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    He needs 1/500th for boxing... Anything slower gets you blurred hands.

    My advice would be to return the rebel and get 20D... as well as 50/1.4

    I know it's lots of money, but you're gonna have trouble getting good shots with 3 frames/sec as opposed to 5/sec and the buffer will clear much faster in 20D

    If you can't afford to spend that much $$, get 50/1.8. 70 bucks and you'll love it.
     
  12. imakefights

    imakefights TPF Noob!

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    Well I guess the whole point is moot now. Everytime I push the shutter button I get an ERR 99 message. I had read about some durability issues with this camera. I sure expected it to last longer than a few hours though. Now I guess I will have to ship it back to the seller whom I just paid a premium for next day air shipping


    Bobby
     

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