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02-28-2012, 06:02 PM   #1
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Is Pentax's high shutter speed real?

It seems like 1/6000 second should have stopped this racecar.

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02-28-2012, 06:10 PM   #2
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It would appear from your shot that 1/6000 s isn't enough!

What you have to do is pan the camera, i.e. follow the car in the viewfinder and - still panning - press the sutter when the car is where you want it.

You may also want to prefocus manually on the spot where the car will be when you take the shot (i.e. forgo autofocus), in particular with that fence being in the way..
02-28-2012, 06:14 PM - 1 Like   #3
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by the looks of the blur, you seem to be panning quicker than the car, because the blur is in the front (looks like the car is going backwards)
It's an art to pan at the same speed of the car and then capture it.
02-28-2012, 06:40 PM   #4
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How did you get it too 1/6000th? What lens did you use? At 400ISO and under track lighting, I don't even see how a 1.4 wide open could have got you to 1/6000th under those conditions.

Also, at 1/6000th, you wouldn't even need to pan the camera to stop the movement of that car...

02-28-2012, 06:46 PM   #5
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Average speed of these guys is 200mph, thats 300feet per second, and at 1/6000th of a second, thats car has travelled a few inches. So it will blur wil still occur if you are not panning correctly. It takes practice, so don't be so hard on the camera.

Also, maybe try taking pics at more of an approaching angle, rather than as they are almost parallel to you and you'll find greater success.

Last edited by cmohr; 02-28-2012 at 07:08 PM. Reason: slight change in phrasing
02-28-2012, 06:52 PM   #6
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QuoteOriginally posted by bdparker Quote
by the looks of the blur, you seem to be panning quicker than the car, because the blur is in the front (looks like the car is going backwards)
That's how it looks to me, too.

I'd love to know what lens and aperture were used here that allowed for that shutter speed under the apparent lighting conditions in the shot. ISO seems strangely low for this.
02-28-2012, 06:58 PM - 1 Like   #7
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Might also be some SR blur if the SR system wasn't properly armed.

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02-28-2012, 07:00 PM   #8
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If I remember my physics, 60 mph is 88 feet/second. NASCAR speeds are about 180 mph, or about 264 fps. Using a 1/6000 sec shutter speed, the car would have moved 0.044 feet (264/6000) or just a tad over a half an inch.(0.528 inch to be exact).

If the chain link fence was in perfect focus, then the car would be just slightly blurred due to motion. With both the chain link fence and the car both blurred, then your panning was not perfectly locked on the car. Panning just right is pretty difficult.

I guess given an estimated distance (from where you are sitting to the car) and the lens your using (focal length), we could determine the width of the frame (in feet), and then determine from that how many pixels a half an inch would be. I am guessing that it would be 100 pixels +/-, and 100 pixels or even 50 would still produce a reasonable amount of blur.

Panning is a very acquired art - hence I like to shoot very stationary objects - like landscapes.



02-28-2012, 07:09 PM   #9
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QuoteOriginally posted by interested_observer Quote
Panning is a very acquired art - hence I like to shoot very stationary objects - like landscapes.
At 0.528 of an inch and at that distance, that is really not a pan'able shot, it would have been better to shoot the shot and sharpen in post. Now, the fence issue comes into play - the shot could have been panned with a shutter speed of around 1/1000th (or even slower) and the panning would have masked the fence (if shot between the fence posts/poles)...
02-29-2012, 01:33 AM   #10
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Everything is blurry, even the static objects like the people and the fence.
How you were holding and moving the camera seems to be to blame.
02-29-2012, 01:53 PM   #11
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QuoteOriginally posted by Adam Quote
Might also be some SR blur if the SR system wasn't properly armed.
I think the Shake Reduction (SR) might not do you any good. That works well to reduce camera shake, but in this case it is your object that is moving. I'm not really sure how good it functions when panning, but it could be you will get better pictures with SR off here.
02-29-2012, 02:56 PM   #12
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QuoteOriginally posted by vloris Quote
I think the Shake Reduction (SR) might not do you any good. That works well to reduce camera shake, but in this case it is your object that is moving. I'm not really sure how good it functions when panning, but it could be you will get better pictures with SR off here.
Probably right - SR tries to compensate for hand motion, but panning is intentional hand motion, so it would try to counteract it. I'd turn SR off for such dynamic pictures.
02-29-2012, 04:59 PM   #13
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The flash field in the EXIF is the clue - 'Flash did not fire, compulsory flash mode'. So it wasn't really 1/6000 sec shutter speed
02-29-2012, 05:24 PM   #14
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QuoteOriginally posted by kh1234567890 Quote
The flash field in the EXIF is the clue - 'Flash did not fire, compulsory flash mode'. So it wasn't really 1/6000 sec shutter speed
this mean that the flash wasn't used even when the camera recommends to use it due to low light. other wise the shutter speed in the exif would be 1/180.
03-01-2012, 12:43 AM   #15
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Some kind of really high panning speed is the only reason I can come up with.
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