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Post by csnewton2701 on Sept 20, 2017 12:02:16 GMT 1
I was talking to a guy at Southport airshow about photography and focusing on moving subjects. He mentioned about back button focusing, now it's something I've never looked into. Has anyone used or is currently using that method of focusing as I'd like to know/understand more from an aviation photography perspective.
Thanks
Chris
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Post by digit on Sept 20, 2017 13:05:50 GMT 1
I've got all my cameras set up for back button autofocus (BBAF) and never use anything else now.
This is for Nikon, not sure about other makes.
Basically AF activation is with with rear "AF" or "AE/AF Lock" button, the shutter release just releasing the shutter with no AF fuction when half depressed. In operation your thumb is pressing the rear button and index finger ready on the shutter release. AF mode needs to be AF-C (continuous).
I find it easier for tracking moving objects and also for focussing then re-composing a static shot.
Don't forget to disable AF on the shutter release too!
If you're shooting Nikon let me know which body you have? I've got it set on 2 x D500's, a D7200 and a D7100. All vary a little bit in the initial set up.
GC |
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Post by csnewton2701 on Sept 20, 2017 13:30:31 GMT 1
Thanks digit.
How would the focus be affected by an object moving towards you? Is it the same as the half depression of the shutter release button but you keep your selected button constantly depressed?
I have a Canon Eos 1200D but saving up for a new body.
Chris
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Post by digit on Sept 20, 2017 13:36:59 GMT 1
That's exactly it!
I'm sure there will be numerous video's on YouTube detailing exactly how to set it up on various Canon bodies, give it a try and see how you get on!
GC
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Post by csnewton2701 on Sept 20, 2017 17:04:45 GMT 1
I had no idea it was that simple. I'll have a look for one that uses my camera. Again thank you.
Chris
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Post by radiostationx on Sept 20, 2017 17:21:38 GMT 1
Back focus button on 1200d I think it's the magnifier/zoom minus button. Don't know if you will find it difficult to review/zoom in & out the frame immediately after taking the shot as theoretically the camera would hunt focus again thinking that you were going to take another frame.
Just a thought.
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Post by bulldog on Sept 20, 2017 20:28:46 GMT 1
I have never heard the term before but presume it just means the focus is via the half depressed shutter button. As has been said it is simply setting the camera to track a moving object. Well it is on a Canon anyway. Problem sometimes arises if the camera is trying to keep focus but the speed of the camera is slow
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Post by digit on Sept 20, 2017 20:46:12 GMT 1
I have never heard the term before but presume it just means the focus is via the half depressed shutter button. No, its the opposite! With BBAF you separate the AF activation and shutter release. AF activation is achieved by keeping the rear "AF-ON" button depressed with your thumb and just pressing the shutter release as normal when you want to take a shot. It's a technique that most pro sports/wildlife shooters and photo journalists have been using for a few years now, if it doesn't suit the way you work then it's only a couple of seconds to revert to your original set up.
Hope this clarifies?
GC
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Post by csnewton2701 on Sept 21, 2017 7:46:37 GMT 1
Back focus button on 1200d I think it's the magnifier/zoom minus button. Don't know if you will find it difficult to review/zoom in & out the frame immediately after taking the shot as theoretically the camera would hunt focus again thinking that you were going to take another frame. Just a thought. Yes it has the * icon above it. I don't think I set up my camera properly when I got it as I get a quick image of what I have just captured but to review it I have to press the play button Chris |
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