neuroanatomist said:
Mark D5 TEAM II said:
I'd love to get more info on the 1DX Mark II's new "invisible subject area AF detection" that is apparently larger than the indicated AF area in the VF:
Interesting comment about this from the DPR Nikon rah-rah boys:
"There's also no reason to assume the D5 doesn't also have this invisible area detection. Our tests indicate the metering sensor extends well beyond the AF frame on Nikons, and since we know Nikons especially use their metering sensors very, very effectively for subject tracking, there's every reason to assume Nikon also has this so-called 'invisible' detection. In fact, undoubtedly Nikon's very, very effective tracking system would certainly have locked and maintained focus on the subject's eyes, whereas as you can see the poor, outmoded Canon tracking joke has mushed up the focus by tracking the subject's face, neck, jersey, and even part of the background."
Looks like the 1D2 AF is even better than the specs sheets suggest.
Fixed that for ya. Next time, please don't selectively quote DPR's totally unbiased statements!!
Thanks for making a point we repeatedly try to make for us. We've mentioned repeatedly at DPR that for long distance, telephoto subjects, one doesn't
need face or eye detection because the depth-of-field (measured sometimes in
meters) is enough to cover most of the entire body. And that body is typically well-isolated in depth compared to either an infinite background (sky behind birds-in-flight, e.g.), or crowd-goers at a stadium many meters behind the running QB.
In such cases, a general understanding of initial subject distance, combined with intelligent analysis of AF points registering either similar distances, or similar distances +/- approaching/receding trends, works quite well. Which is why even a 5D Mark III without an image sensor as a metering sensor can even subject track at all. Although this method works well for subjects isolated in distance - which tends to be the case for telephoto subjects - it has its limitations (
https://www.youtube.com/watch?v=F58xGAaxhrA). Complement distance-based subject tracking with some weighting towards color/pattern information, though, and you decrease the chances that the subject tracking algorithm jumps off to the wrong subject, a problem inherent to cameras like the 5D Mark III that rely only on distance information to subject track. That's why wildlife photographers, for example, have found the 7D Mark II to progress over the original 7D with its introduction of a high-resolution metering sensor (
http://www.dpreview.com/articles/8712824369/tamron-sp-150-600mm-f-5-0-6-3-di-vc-usd-field-test).
But a bride or a toddler at 35mm f/1.4 and closer subject distances is a different story: depth-of-field is measured in centimeters, so for accurate focus, you need to distinguish an eye from a nose from an ear from hair.
Your comment appears to imply we thing face/eye tracking is the end all, be all of photography. Not true. Face/eye tracking, and even that level of subject tracking, matters for
certain types of photography, and
doesn't matter for others. And if you're not subject tracking, even the 1DX's (let alone the 1DX II) ability to focus continuously on subjects with one AF point is second to none. You can consider that our official statement, and suggesting we're suggesting otherwise is, frankly, specious.
Rishi
Technical Editor | Digital Photography Review