Author Topic: Which AF method are you using  (Read 3195 times)

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Offline REX (aka TG)

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Which AF method are you using
« on: March 06, 2012, 04:17:42 PM »
-Spot
-Local
-Wide
-Zone/Which zone (Only with a77)

With a77 I'm usually use Zone and preferable central and on static object local AF sensor & selecting them with the joy stick.

With a900 i am using on fast moving object mostly the Double cross center sensor and and on static object local AF sensor & selecting them with the joy stick.

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Offline Clive

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Re: Which AF method are you using
« Reply #1 on: March 06, 2012, 11:41:47 PM »
Using local and it is usually set on the center...so effectively it is spot.

Below is copied from one of my GIF posts...because I like this shooting/focus feature.

....see page 41 of Friedman's book regarding release priority. He says:
Using Release Priority, you can tell the camera to take the picture
RIGHT NOW, rather than waiting until the camera thinks the subject
is in focus. (In fact, this one’s so useful I’ll tell you where to find
that now: MENU►[camera icon] ►3► Priority setup►Release)


This is detailed starting on page 209.

This is a good feature IMHO. If the camera has failed at focusing (it happens) it is frustrating when you push the shutter and nothing happens. With the camera set as described, the shutter is released anyway. Yes, some photos are not in focus, but you keeping shooting and keep following though (panning) and, if it is long flight event, the camera will get it right sooner or later. In the past two days perhaps two of (what?) fifty++ flight events have failed to produce one acceptable photo because of "no focus."

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Offline markc

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Re: Which AF method are you using
« Reply #2 on: March 07, 2012, 09:51:13 AM »
Centre spot - almost always.

Theonly time i would use anything else would be if I were somwhere requiring 8+ fps (motor racing, sporting event, airshow, etc.) and/or with fast moving objects that I couldn't guarantee to keep in the centre of the FOV.

I almost never get an out of focus pic (maybe 1 in 50 or less?)

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Offline Jumeirah

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Re: Which AF method are you using
« Reply #3 on: March 07, 2012, 10:06:40 AM »
For AF i use Wide and Spot most of the time.

Of late i have been experimenting with Zone. Its new to me and very useful. Say i take a vertical portrait i can set the top zone exclusively for the persons face. off-course the focus does not remain on the eyes but still the results are interesting. Also zone i have been using for moving planes or cars where i need a certain area to cover.

cheers,
Rui
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Offline paul_b

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Re: Which AF method are you using
« Reply #4 on: March 07, 2012, 06:14:41 PM »
I use local, like Clive usually on centre so effectively spot. However when using continuous focus on a moving object, local allows you to focus off centre and position the subject away from the centre of the frame.
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Offline rogprov

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Re: Which AF method are you using
« Reply #5 on: March 07, 2012, 06:20:50 PM »
Spot almost always.
Roger

Offline Rick

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Re: Which AF method are you using
« Reply #6 on: March 07, 2012, 06:34:03 PM »
being relatively new I find this really intriguing, i own an A77 and surprised at the varied answers, does one setting help with a particular subject or is it the photographers personal choice, I would love to see a poll on this, based on preference over subject, I have much to learn and details such as this can have a major impact on a newbies learning curve basically drawing on the knowledge of the more experienced,
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Offline rogprov

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Re: Which AF method are you using
« Reply #7 on: March 07, 2012, 06:49:22 PM »
being relatively new I find this really intriguing ....

I use spot nearly always because I want to choose precisely where it focuses and with my a900 I find that the quickest. I do mostly close-up/macro stuff so I guess that heavily influences my choice.
Roger

Offline Fud

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Re: Which AF method are you using
« Reply #8 on: March 07, 2012, 07:30:48 PM »
What's Autufocus - is it one of these new fangled options on the camera ??? :)




Depends what I am photographing but use all four types on the A77.

If it is small and not moving too much, like small birds in trees, I use centre spot
If it is a bird in flight or sport I generally use either wide or zone
If the subject is fairly stationary and I need to compose the picture I tend to use local
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Offline Cputeq

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Re: Which AF method are you using
« Reply #9 on: March 09, 2012, 06:48:45 AM »
I've been using local, only because zone seems to be really, really hit or miss with my A77 and it seems to work a lot better in Af-C than AF-S, as I'll get false locks all the time using AF-S (with two different lenses!).

I thought one of my lenses was really not good until I experimented and found out zone was giving me false "in focus" readings, etc.  Very perplexing, though it seems to work okay in tracking objects moving across frame.

So, local for me - it seems much more accurate in focusing for AF-S or AF-C.

Offline Stef.

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Re: Which AF method are you using
« Reply #10 on: March 09, 2012, 06:38:46 PM »
being relatively new I find this really intriguing, i own an A77 and surprised at the varied answers, does one setting help with a particular subject or is it the photographers personal choice, I would love to see a poll on this, based on preference over subject, I have much to learn and details such as this can have a major impact on a newbies learning curve basically drawing on the knowledge of the more experienced,

For fast action I use zone.
Yes there are differences:
For instance if you use spot AF and you focus on an eye in a portrait and you use a shallow depth of field, by first focusing on the eye and then repositioning the camera you can easily get the eye out of focus when shooting with a shallow depth of field. So if you shoot a portrait it is better to choose the right AF with the joystick. For action the zone continuous AF system works very well, at least for me. I shot quite a few basketball and volleyball games as well as a couple of soccer games. I had nearly all of my shots in focus. (Perhaps 5 or so out of 500+ shots were not in focus). Also keep in mind: whatevr focus mode you choose, by pressing the little joystick you get spot focus feature instantly.
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