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693 focus points how do they work

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carusoswi View Drop Down
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Post Options Post Options   Quote carusoswi Quote  Post ReplyReply Direct Link To This Post Topic: 693 focus points how do they work
    Posted: 21 April 2017 at 00:55
So the new A9 has that many focus points. I'm an a700 user, shoot film with a pair of Maxxum 9. A700 has 9 points I think. The 9 has 3. I hate the multi point focus on those bodies and only use the center point.
I can't imagine having 693 of them. What am I missing.
Caruso
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sybersitizen View Drop Down
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Post Options Post Options   Quote sybersitizen Quote  Post ReplyReply Direct Link To This Post Posted: 21 April 2017 at 05:08
The advantage is mostly for action shooters who want to track moving subjects; a huge number of AF points will be useful when you're chasing something moving quickly and/or erratically and you're challenged just to keep it located anywhere within the frame.

(I personally don't shoot such things, so I too have been managing fine for 11 years with just one good AF point in my cameras.)
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lonewolf View Drop Down
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Post Options Post Options   Quote lonewolf Quote  Post ReplyReply Direct Link To This Post Posted: 21 April 2017 at 05:29
yeah its really used for tracking, especially useful in sports and wildlife when you dont really have time to select a spot, or are unable to keep your selected spot over the target.

I've not had that great success with lock-on modes on Sony cameras but the idea is you place it over the subject (or let camera decide on subject), and focus sticks with them wherever they go.

Its also handy for being able to frame a subject to the far edge of the frame if you want to compose that way.

RE the A9, honestly the number is more marketing than anything, you'll find that generally there is a whole cluster of the points used - this may be more accurate then one big one.
I suppose it depends on the size of the subject
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addy landzaat View Drop Down
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Post Options Post Options   Quote addy landzaat Quote  Post ReplyReply Direct Link To This Post Posted: 21 April 2017 at 07:13
I use single point with most of my older cameras like the A900 - partly because of predictability, partly because the outer focuspoints aren't that good.

One thing I found useful with the A77m2 is that is is great for recomposing. Put the camera in AF-C, put the selected (center) focuspoint on your subject and recompose - the camera will keep it in focus.

With the A9 (and A77m2 btw) you have focuspoints across the frame, making it easier to focus where you want, making it easier to make a great composition already in your camera!

The high number isn't just marketing, there is actual use for it. The spread can be very important.
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lonewolf View Drop Down
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Post Options Post Options   Quote lonewolf Quote  Post ReplyReply Direct Link To This Post Posted: 21 April 2017 at 07:28
Spread is good, but the sheer number can be a bit over the top (that said you probably cant have spread without gaps)

I'd consider a whole bunch of them more like "assist" points than anything
I'd say that small and medium group would get more use than single point
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Miranda F View Drop Down
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Post Options Post Options   Quote Miranda F Quote  Post ReplyReply Direct Link To This Post Posted: 21 April 2017 at 13:34
Originally posted by addy landzaat addy landzaat wrote:


One thing I found useful with the A77m2 is that is is great for recomposing. Put the camera in AF-C, put the selected (center) focuspoint on your subject and recompose - the camera will keep it in focus.

Yes, the A58 does that too. Presumably not as well, but it works for me.
A58, 5d, Dynax 4, 5, 60, 500si/600si/700si/800si, various Sony & Minolta lenses, several Tamrons, lots of MF primes and *far* too many old film cameras . . .
 



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