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| 11 point focusing - Page 2 | |
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| Posted: Sat May 23rd, 2015 15:28 |
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11th Post |
Eric
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So ...leaving aside 3D focusing ( which brings colour recognition to dynamic focusing) the principle of 9, 11, 24 or 51 point focusing is the same...it's just the size of the area referenced that differs. Yes? The choice of which number to use is therefore (presumably) purely dictated by the type of subject, its surroundings (or the size of the subject in the frame) and its mobility. Yes? I guess tha choice of 11point is for subjects that have limited differnt discernible reference points around the subject eg birds in flight, flower in grass, ducks on water... OR... the extent of movement of the subject in the viewfinder is not too great. Yes?
____________________ Eric |
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| Posted: Sat May 23rd, 2015 16:54 |
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12th Post |
Robert
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Eric, Yes I am still here... I remarked some time ago that when I use my D3100 I tend to use it as a snapshot camera, I just grab it and press the button. I have it set on full auto, shock horror!! When I am greasy up to my armpits and just need a quick pic of some tremendously interesting bolt or floggle-toggle, I can't be a**ed to make manual adjustments, I just want a usable pic. Anyway I have remarked that often the auto can produce remarkably good images, better than I might expect had I made my own manual settings at times. I sometimes wonder why the auto can produce such good images. I seem to remember your reaction was to take the same image in both auto and using manual with my idea of what settings I thought appropriate for the scene, then compare the EXIF to perhaps reveal it's secret techniques. I have noticed that depending on the scene, in full auto, various focus points flash in and out as I compose and zoom the lens to optimise the image composition, they seem to lock on to points and features of the subject but any of the focus points can activate depending on the subject. I am wondering if you did the reverse of what I am doing and took some fully auto exposures, as well as some manual, or semi manual exposures, then compared the EXIF's and of course the images... Then perhaps that might clarify what these multi point focus points are actually doing. I realise my D3100 is somewhat primitive compared with some of the more modern bodies but it's the principle I am thinking of. Just a thought...
____________________ Robert. |
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| Posted: Sat May 23rd, 2015 17:27 |
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13th Post |
Graham Whistler
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I guess tha choice of 11point is for subjects that have limited differnt discernible reference points around the subject eg birds in flight. I agree Eric that is seeming to work well provided the subject remains fairly central. With a flock of birds in the air perhaps use 24? I do think that up to a max of 11 points they have a lot more processing power than the outer points.
____________________ Graham Whistler |
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| Posted: Sat May 23rd, 2015 19:49 |
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14th Post |
TomOC
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The D750 has '3D focusing' which does that.... Off to read the manual.  I'm so out of it. I love the D800 but use less and less of the features - once I set it up I rarely make many changes...wasting some great technology, I'm sure. Now that I see Profoto studio strobes with internal batteries and TTL for Nikon, I might have to get more serious about learning what my camera can do... Tom
____________________ Tom O'Connell -Lots of people talk to animals.... Not very many listen, though.... That's the problem. Benjamin Hoff, The Tao of Pooh |
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| Posted: Sun May 24th, 2015 02:32 |
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15th Post |
jk
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Eric wrote:So ...leaving aside 3D focusing ( which brings colour recognition to dynamic focusing) the principle of 9, 11, 24 or 51 point focusing is the same...it's just the size of the area referenced that differs. Yes? Yes. In the reading materials on the Nikon website there is a good paper on the different AF types and their uses.
____________________ Still learning after all these years! https://nikondslr.uk/gallery_view.php?user=2&folderid=none |
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| Posted: Sun May 24th, 2015 03:56 |
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16th Post |
Eric
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Graham Whistler wrote:I guess tha choice of 11point is for subjects that have limited differnt discernible reference points around the subject eg birds in flight. Good point about perimeter focus points processing power drop off. Gilbert also made a good point about the amount of effort taken out of AF speed using more sensors than necessary.
____________________ Eric |
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| Posted: Sun May 24th, 2015 04:18 |
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17th Post |
Eric
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Robert wrote:Eric, Yes I am still here... I remarked some time ago that when I use my D3100 I tend to use it as a snapshot camera, I just grab it and press the button. I have it set on full auto, shock horror!! When I am greasy up to my armpits and just need a quick pic of some tremendously interesting bolt or floggle-toggle, I can't be a**ed to make manual adjustments, I just want a usable pic. Robert who? This all came about when Jan had difficulty focusing on an eider duck bobbing on ocean swell and then some maritime flora blowing in an on shore breeze. Yes we were in London. No, seriously, it was a very pleasant short break on the Northumberland coast. I started fiddling with her camera to see what alternative settings the new Panasonic offered...and then tried to cross reference these with the 'known' options on my D750. That's when I realised I didn't know diddlysquat about some of these functions on my new camera. Like, I was thrown as to what 3d focusing was ....and with the manual 200miles away (yes I know) I dug myself a numptie hole. You make a good point about auto settings. A lot of sophisticated and clever programming has gone into auto settings. As you may recall, when using photoshop, I frequently apply auto everything settings to an image just to see a point of difference. (Then revert and do manual corrections) Particularly after staring at monitors over time, it's easy for your eyes to miss colour casts, saturation and contrast on images. Quite often changing them drastically, even if it's for the worse, can reboot your seeing eye. So yes, a spell of auto shooting might be interesting. The problem Jan had was in truth multifaceted. 400mm equiv.....windy day....tripod in car 1mile away (duh) changing lighting (sun then black clouds) white and black subject moving about. I didn't even bother to get my camera out of the bag....but you know Jan!  Anyway, I think it's a matter of softly softly and trying out the different techniques. Like Graham is doing looking for improvements in success rate.
____________________ Eric |
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| Posted: Sun May 24th, 2015 04:45 |
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18th Post |
Eric
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In fairness exposure calculation was a bit tricky...even for the D750. So come on....what exposure compensation and AF would you use for this situation???? Attachment: duck4.jpg (Downloaded 33 times)
____________________ Eric |
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| Posted: Sun May 24th, 2015 04:45 |
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19th Post |
Eric
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I waited till they swam into the lea of the harbour. Attachment: duck2.jpg (Downloaded 33 times)
____________________ Eric |
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| Posted: Sun May 24th, 2015 04:52 |
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20th Post |
Eric
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and another Attachment: duck1.jpg (Downloaded 33 times)
____________________ Eric |
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| This is topic ID = 1188 Current time is 11:42 | Page: 1 2 3 4 5 | |
| Nikon DSLR Forums > Camera and Lens Forums > Lenses > 11 point focusing | Top | |
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