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raylee011 Jul 31, 2011 7:00 AM

How to take Fast Moving Objects
Hi All,

I have a Pentax K-X and I was using the 300mm Kit Lens today at Seaworld.

It was around 7pm with cloud. So, there is not much sun left.

I set the ISO to 400 and F5.6.

I am having hard time capturing the dolphin and performers diving into the water. The pictures just don't come out right, all out of focus.

Can someone help me please? I will go back and try again. I have annual pass.


JimC Jul 31, 2011 7:34 AM

Try ISO 1600, and pan with the action so that the performers are relatively stationary in the frame.

Each time you double the ISO speed, the camera can use shutter speeds twice as fast for a given aperture and lighting.

What were your shutter speeds at ISO 400 and f/5.6? They'll be 4 times as fast at ISO 1600 and f/5.6 in the same lighting. You'll probably want to target 1/500 second or faster if possible (and that will depend on light, and how much noise you can tolerate by continuing to increase ISO speed.

Bob Nichol Jul 31, 2011 7:42 AM

You may have motion blur due to slow shutter speeds more than poor focus. You need good light for fast shutter speeds.

I have had some success using the following in both daylight and artifical light:

AF-Continuous mode
Try Auto Area AF point selection. You can try Center as well but it's hard to keep the focus point on the moving subject.
Auto (selectable range) ISO. Avoid using the highest speed. See my post
Metered Manual Shooting mode
Try shutter speeds of 1/500s and 1/1000s
Try aperture one stop down from wide open such as f/5.6 or f/8
Continuous Hi Drive mode. Start shooting as the action begins. Not every shot will be good but you should get some good ones.
Follow the subject in the viewfinder.

frank-in-toronto Jul 31, 2011 7:42 AM

Presuming the "out of focus" comment is correct, you should be pre-focusing on the expected jump spot.

wave01 Aug 2, 2011 5:16 AM

1 Attachment(s)
have had success at Sea World Orlando using a canon T2i/550d in A1 servo mode centre focusing hers one at ISO 200 f10 1/400 using a 55-250is.
There is a bit of luck but I try to keep focused with the shutter half down then the servo mode keeps focus. Take lots of shots and good luck

raylee011 Aug 3, 2011 4:18 AM

I went back to Sea World and I took some pictures too. I think this time is much better because it was very sunny.

Next time, I want to take pictures at the night show. Any suggestion what kind of setting?
Here are a few shots that I took

Bob Nichol Aug 3, 2011 8:26 PM


Next time, I want to take pictures at the night show. Any suggestion what kind of setting?
If the suggestion I gave above doesn't work then you don't have enough light.

raylee011 Aug 3, 2011 8:33 PM

Thanks for the advice. I will give it a shot. Will a flash going to help. I guess not because the object will be too far.

VTphotog Aug 3, 2011 10:31 PM

A very powerful shoe mount flash, which has zoom function, might give you enough extra light to help, depending on how far away you are. At higher ISO settings, I have gotten decent results at over 50 meters.


shoturtle Aug 3, 2011 10:38 PM

You will not have enough light with the 55-300 to avoid motion blur even at 3200iso. Also the low light AF of the pentax is not as good, so you will notice the lens hunting trying to lock focus.

You might need a f2.8 zoom lens for the night stuff with 3200iso, but that still might not be enough light avoid motion blur. You are talking about a 800 dollar lens for a sigma 70-200 2.8.

Also with that kind of distance, a flash may not do much, especially the built in one.

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