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Thread: Need help to focus fast object.

  1. #1

    Smile Need help to focus fast object.

    Hi i new with camera.I want to take photo of a moving car with sharp image but the back ground blur.how to do it.thks

  2. #2
    Senior Member geraldkhoo's Avatar
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    Default Re: Need help to focus fast object.

    Quote Originally Posted by kenkp View Post
    Hi i new with camera.I want to take photo of a moving car with sharp image but the back ground blur.how to do it.thks
    The technique is called panning... have a read from the following sites...

    http://digital-photography-school.co...ving-subjects/

    http://www.ephotozine.com/article/Camera-panning

    http://en.wikipedia.org/wiki/Panning_(camera)
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    Default Re: Need help to focus fast object.

    Quote Originally Posted by geraldkhoo View Post

    i think he could have meant a shallow depth of field, not necessarily panning

    to help achieve focus faster, you can try focusing on somewhere you estimate the car will pass by first, like the road, then depressing the shutter button fully when the car passes the point.
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    Default Re: Need help to focus fast object.

    When i was new, my senior told me to increase the shutter speed to around 500 to 800 etc and with steady hand held or tripod assist. To plan your shoot, move your hand together with your cam as the object passes by your cam and SNAP the pics.

    Hope this would helps and it works for me many times.....

  5. #5
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    Default Re: Need help to focus fast object.

    Fast shutter speed, open up your aperture to f4 or f5.6 and fire away
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    Default Re: Need help to focus fast object.

    Hi since he wanted a blur background, wouldn't the faster shutter speed freeze the background up?
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    Default Re: Need help to focus fast object.

    Quote Originally Posted by Jeronleow View Post
    Hi since he wanted a blur background, wouldn't the faster shutter speed freeze the background up?
    Nope. If it is still images, you get bokeh, if it is panning images, you still need fast shutter speed to render the background blur and subject sharp
    Canon 5D mkII|24-105 F4 IS L|70-200 F4 IS L|135 F2 L|580EX|

  8. #8

    Default Re: Need help to focus fast object.

    thks for the guide.
    I using canon 30D.I have the kit 1 len,EF-S55-250MM F/4 5.6 IS and TAMRONAF18-200MM F/3.506.3 XI DI2 LD LEN.Which of these lens is better to shoot fast object.thks

  9. #9

    Default Re: Need help to focus fast object.

    Quote Originally Posted by yehosaphat View Post
    Nope. If it is still images, you get bokeh, if it is panning images, you still need fast shutter speed to render the background blur and subject sharp
    Nope. The slower the shutter speed, the more blur you will get for the background for panning shots.

    The longer the shutter is open, the longer the image sensor is exposed while the camera follows the moving car. If the camera follows the car's movement at an appropriate speed (depends on the car's speed), then the car will appear sharp in the image captured as the car's image remains largely steady within the camera's image sensor during the whole duration of the opened shutter.

    At the same time, during the duration in which the shutter is open, the background (which is stationery) will move across the image sensor as the camera follows the car's movement. So the slower the shutter speed, the more time the background is allowed to streak across the image sensor and therefore the more blur the background will appear in the captured image.

    Try using slow shutter speed of 1/10 or slower and pan your camera, you are likely to get movement blur image. But if you try 1/1000 or faster and pan your camera, you're likely to get everything from foreground to background all without movement-related kind of blur. (Bokeh and DOF is a separate issue altogether here).

    The key to panning shots to have blur background is to have a slow enough shutter speed (not fast shutter speed as you said) relative to the panning speed (of movement of camera following the moving car/object) so that the background actually streak across the image sensor during the time when the shutter is open.

    Therefore the appropriate shutter speed for panning is usually around 1/60 - 1/250, depending on how far, how fast and how large the moving subject is.

    This can be seen in that, in stark contrast to panning shots, a fast enough shutter speed is required to avoid movement related kind of blur captured in the final picture.

    This is exposure 101.

    Anywhere here's a thread containing some panning shots of F1 cars during the Grand Prix at Sepang last weekend. Shutter speeds used were 1/125 or 1/160 or 1/250. The slower the shutter speed used, the more blur the background will be but there is an increasingly higher risk that the car is not sharp as you need to maintain the car's image steady on your camera's image sensor for a longer duration (slower shutter speed = longer opened shutter duration).

    http://www.clubsnap.com/forums/showthread.php?t=362288
    Last edited by Clockunder; 24th March 2008 at 07:39 PM.

  10. #10

    Default Re: Need help to focus fast object.

    Below is one of my panning shots taken at shutter speed 1/80. As I followed the Ski-scooter and panned my camera, the background was captured blur with a relatively slow shutter speed. In outdoor sunny day situation, it usually means needing to stop down your aperture to very small : F/11-F/16 is common at ISO 100 (remember the sunny 16 rule where the appropriate exposure is about 1/100 at F/16 a ISO 100? So if you're using 1/200, then it's about F/11 at ISO 100). In this case, I used F/11 which was the smallest available in my camera and that day was not exactly sunny and therefore I was able to use slightly more than a stop more exposure than the sunny 16 rule (1/200 at F/11 vs 1/80 at F/11).

    If a too fast shutter speed is used (such as 1/500 or faster), then everything from foreground to background are likely to be freezed sharp and the picture will therefore lose the impact of conveying movement/speed.

    Last edited by Clockunder; 24th March 2008 at 07:59 PM.

  11. #11
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    Default Re: Need help to focus fast object.

    Thanks for the clarification!
    Canon 5D mkII|24-105 F4 IS L|70-200 F4 IS L|135 F2 L|580EX|

  12. #12

    Default Re: Need help to focus fast object.

    thanks for your help.I try out this weekend.

  13. #13

    Default Re: Need help to focus fast object.

    On the same note...
    When taking panning shots, do u guys use chutter priority??

    Regards

  14. #14
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    Default Re: Need help to focus fast object.

    yes.. you'll need shutter priority to "fix" your shutter speed.. =)

    btw.. how blur you want the background to be depends on the shutter speed as well.. more blur = slower shutter.. but remember that the slower the shutter.. the more precise you have to "track" your subject for it to remain sharp..

    cheers and happy panning~

  15. #15

    Default Re: Need help to focus fast object.

    Never done panning but i would like to ask out of curiousity.

    How do you guys follow the "moving object" when you click the shutter?
    The view finder would be blocked by the shutter.

  16. #16

    Default Re: Need help to focus fast object.

    Quote Originally Posted by yamapi View Post
    Never done panning but i would like to ask out of curiousity.

    How do you guys follow the "moving object" when you click the shutter?
    The view finder would be blocked by the shutter.
    Keep the other eye open and just follow.. You must follow the subject, and follow through when you release the shutter until the mirror comes back down.

  17. #17

    Default Re: Need help to focus fast object.

    Quote Originally Posted by lsisaxon View Post
    Keep the other eye open and just follow.. You must follow the subject, and follow through when you release the shutter until the mirror comes back down.
    So it's a game of luck and alittle prediction?

  18. #18

    Default Re: Need help to focus fast object.

    Quote Originally Posted by yamapi View Post
    So it's a game of luck and alittle prediction?
    Not luck lah.. practise and practise.. Prediction is very important in action photography.

  19. #19
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    Default Re: Need help to focus fast object.

    Quote Originally Posted by lsisaxon View Post
    Keep the other eye open and just follow.. You must follow the subject, and follow through when you release the shutter until the mirror comes back down.
    yep, that's what i do.
    else u can estimate the movement while panning.

    either way works if u had enuff practise.
    so shoot and practise more.

    quite easy to practise. just stand by the road outside ur hse with ur camera.
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  20. #20
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    Default Re: Need help to focus fast object.

    One tip for panning is to shoot like you were exercising your waist from left to right and right to left etc. Also, a follow through on the subject is important. Dont stop panning immediately but follow through with the subject.

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