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TOPIC: How to get an acurrate focus on a moving subject?

How to get an acurrate focus on a moving subject? 3 years 3 months ago #4759

I was having a hard time focusing on this little guy jumping and flying off of his perch. These are my two best shots but they are still a little off.





Any advice would be appreciated.
Last Edit: 3 years 3 months ago by Julie Anne Moore.
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How to get an acurrate focus on a moving subject? 3 years 3 months ago #4774

  • Tim Shrimpton
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A continuous auto focus mode (AF-C on my Nikon) should, in theory, track the object and adjust as needed while the object is moving. I've done tests with my son running around with mixed results. If you have any way to anticipate where the subject is going to be moving (say, a baseball player running down the baseline), you can orient yourself so that your plain of focus is parallel with the motion so that there movement won't take them out of that focused area. But with birds as you have pictured, that's pretty impossible to predict.
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How to get an acurrate focus on a moving subject? 3 years 3 months ago #4781

  • Bill
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well basically if the closer or faster the subject is the faster shutter speed you need. If the subject is moving 45 degrees to the camera you'll need approximately double the shutter speed and parallel is about 3 times the shutter speed. I have a camera app(Photo Tools by hcpl) that has a minimal shutter speed calculator on it. That was my reference for the above numbers, not sure if there are any hard and fast rules to it!
here's a link to an online calculator that should help:

johndudak.com/photographers/sp2.php#spp
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How to get an acurrate focus on a moving subject? 3 years 3 months ago #4782

Thanks.

The shutter speeds were 350th/s and 500th/s both at f/4 and ISO 500.
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