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General photography questions and answers: Discuss focus...hi all, can anybody help.. i have been taking pics of a kingfisher with a 70-300mm i s lens and ...
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Old 13-09-2009, 21:11   #1 (permalink)
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focus

hi all, can anybody help.. i have been taking pics of a kingfisher with a 70-300mm i s lens and at about 75 ft and focus is really searching and giving some out of focus images, i think maybe im pushing the lens but stuff further away like ducks flying are really sharp i have a friend to who is using a nikon set up (mine is canon) having same prob. any ideas ?
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Old 13-09-2009, 21:31   #2 (permalink)
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Re: focus

Focus manually, try a set up in your garden or some suitable venue, just put a target up use f8 or f11 hand focus on it take a pic, same again but use auto focus. I have been told that some long zooms are not too good at its longest setting which gets worse if you use a converter.D/F can be a problem too, if ducks are sharp in the background it has to be a focus tech problem!
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Old 13-09-2009, 21:44   #3 (permalink)
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Re: focus

Auto focus needs good contrast to work effectively. If you are trying to shoot in conditions where the light is not good and the contrast is low you will have problems. Also, some lenses and cameras will AF faster than others.

If the ducks at longer ranges are sharp, we can rule out camera shake - or can we? If the Kingfisgers are in lower light conditions and the exposure is being increased by the camera by reducing the shutter speed, camera shake could be the answer.
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Old 13-09-2009, 22:25   #4 (permalink)
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Re: focus

thanks the light was a little on the dark side it was early ,though i got foliage nearer and darker in focus . ill have another go and watch the light . thanks for you help it is much needed and very appricated
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Old 13-09-2009, 22:29   #5 (permalink)
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Re: focus

Could be useful to see the shots you are talking about. Might help to identify the problem. From your last post it might be the focus point that you are using.
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Old 14-09-2009, 09:22   #6 (permalink)
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Re: focus

Just read an article in my Club magazine about this problem. The author was trying to photograph Kingfishers from the new hide at Slimbridge. He eventially discoved a method of focusing called "back button focusing" I understand that the idea originally came from Canon but features in several brands now. Rather than try to repeat the details here, you can read the article yourself on our club website (cheltenham Camera Club) below. The Club magazine is called In Focus. You are welcome to read the article by Rob Duncalf who received support from the Canon Digital Learning centre. If you wish to reproduce the article, please contact the In Focus editor (details on the front page). I plan to give this technique a try myself.
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