Timeline for Why is my camera missing the action again and again?
Current License: CC BY-SA 4.0
11 events
| when toggle format | what | by | license | comment | |
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| Nov 12, 2021 at 19:42 | comment | added | Michael C | I've been shooting Canon's AF system since the mid-1990s. When 4-point or 8-point assist points (what you call expansion) are selected, the areas of sensitivity are even wider. | |
| Nov 12, 2021 at 15:07 | comment | added | Steven Kersting | It did offer Canon's typical focus point expansion; and his results look pretty much like what you would expect from that mode. I can fairly well guarantee that you will not get those types of results using the single point focus mode (or spot). | |
| Nov 12, 2021 at 6:06 | comment | added | Michael C | The original 7D did not offer Canon's iTR active tracking mode. That didn't come along until three years later with the 1D X in 2012. The 7D Mark II had it when it was introduced in 2014. | |
| Nov 12, 2021 at 6:01 | comment | added | Michael C | Deny all you want, that's the way multi point AF systems work. The areas are even larger when 4 or 8 assist points surrounding the selected AF point are also enabled. Test it using his methodology, both with and without dynamic modes enabled. He said he was "tracking the subject" using a specifically chosen AF point. He also said he used to "track" the subject with the center point using a camera that had no active tracking AF mode, so you can also take what he means when he says "tracking" to mean moving the camera to keep the selected AF point on the subject. | |
| Nov 10, 2021 at 13:37 | comment | added | Steven Kersting | The AF will not give results like that when single point is selected; at least none of my Nikon's ever have (nor has any other camera I've checked). | |
| Nov 10, 2021 at 13:37 | comment | added | Steven Kersting | You can get result similar to Andre's if you are in a dynamic/tracking mode... In that case the camera will use information from the points immediately surrounding the selected point to aid in quicker acquisition. It will even use a surrounding point to finalize focus if the selected point doesn't have good detail (Nikon). He specifically stated using tracking and noted "the active focus point;" not the selected focus point. | |
| Nov 10, 2021 at 3:05 | comment | added | Michael C | Try the method demonstrated in this post at Andre's Blog on one of your Nikon DSLRs. You might be surprised by what you find. Pretty much all of the PDAF systems from all of the manufacturers of DSLRs were similar. Long lines on the PDAF array were shared by several AF "points" along those lines and the coverage area for each "point" often overlaps adjacent ones. | |
| Nov 8, 2021 at 19:45 | comment | added | Steven Kersting | Yes, each focus point is a pair of grouping of photodiodes along a pair of lines... so, not a singular one dimensional point. But I have never found them to be larger than displayed nor to overlap... and I have tested numerous cameras of numerous brands for focus points/accuracy (I have found focus points that do not align perfectly with the overlay display... not the same thing). | |
| Nov 8, 2021 at 18:55 | comment | added | Michael C | Keep in mind that the actual area of sensitivity for each focus "point" (which is actually a two-dimensional rectangle, not a one-dimensional point) is usually much larger than the small rectangles in the viewfinder, and often overlap, sometimes significantly so. | |
| Nov 8, 2021 at 16:21 | history | edited | Steven Kersting | CC BY-SA 4.0 |
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| Nov 7, 2021 at 14:43 | history | answered | Steven Kersting | CC BY-SA 4.0 |