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Olympus OM-D E-M1 The first Micro Four Thirds camera that offers phase detect focusing so you can use Four Thirds DSLR lenses normally as well a Micro Four Thirds lenses.

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Old 3rd May 2014
Maczero Maczero is offline
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Back button focus with the 50-200

I am very much obliged to Tony who suggested using back button focus with the 50-200. First try this morning allowed me to capture this, which I would never have managed otherwise (from about 30m - so pretty heavily cropped):

Starling_14-05-03_08-31_P5030038_©Andrew_Macnaughton_2014 by Amaczero, on Flickr

Thanks again.

Andrew
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Old 3rd May 2014
TonyR TonyR is offline
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Re: Back button focus with the 50-200

Congrats! Great shot.

One of the nice things about back-button focusing is that you can shoot more than one shot or burst while continuing to track the subject. When I used C-AF on the shutter button, I could not repeatably take a shot and then just lift off just enough to maintain half-press shutter. With back button focus, you focus with your thumb and shoot with your index finger as and when you want.
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Old 3rd May 2014
Mauro Matacchione Mauro Matacchione is offline
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Re: Back button focus with the 50-200

I found it easier to focus with the front function buttons
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Re: Back button focus with the 50-200

Mauro

I've got the BBF assigned to the Fn 1 button at the moment, but I am not sure that this is the most ergonomic option for me (better than the AEL button, though). I have some experimenting to do.

Andrew
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Old 3rd May 2014
Mauro Matacchione Mauro Matacchione is offline
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Re: Back button focus with the 50-200

I think in my case it's more ergonomic mainly because i use my omd with the battery grip and the front fn-1 and fn-2 are a little hard to reach with my thumb when in vertical position and I prefer the front ones.
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Old 4th May 2014
brian1208 brian1208 is offline
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Re: Back button focus with the 50-200

Thanks for the ideas all, I spent a happy hour playing with this, using the fn2 button for CAF focus as, like Mauro, I found that worked best with the grip on

(mind you, I should have been shooting kite-board racing with the 50-200, except the official website showed the wrong start time - 6pm and when I got there the last competitor was packing up, smiled sympathetically and told me they started at 9am and finished at 4pm - they'd had a great day too!)

Still to analyse my images yet but a quick question (probably stupid, so forgive me if it is ) When I press fn2 the green box shows and I hear the focus confirmation, does it continuously refocus on the subject, so long as I keep it within the focus box? (the green box no longer shows, which is why I wondered)

It felt like a great technique to use so if the results confirm this, thanks a lot
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Old 9th May 2014
Mauro Matacchione Mauro Matacchione is offline
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Re: Back button focus with the 50-200

I don't think it continuously refocus on the subject unless you are in Continuous AF :]
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Old 9th May 2014
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Re: Back button focus with the 50-200

Thanks for responding Mauro, yes - I got that it needs to be in CAF mode but my question was did it only continuously focus so long as the "back button" was depressed or having focused, did it continue to focus after the button was released but before the shutter button was depressed.

I get the impression that it only continuously focuses so long as the "back button" is depressed?
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Old 9th May 2014
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Re: Back button focus with the 50-200

Quote:
Originally Posted by brian1208 View Post
Thanks for responding Mauro, yes - I got that it needs to be in CAF mode but my question was did it only continuously focus so long as the "back button" was depressed or having focused, did it continue to focus after the button was released but before the shutter button was depressed.

I get the impression that it only continuously focuses so long as the "back button" is depressed?
Brian, that's right. It will only focus while you have the back button pressed. That's useful for pre-focussing at the approximate subject distance and then waiting for the action to happen.
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