pcvrz22g wrote:
Ok I have a question about the 7D focus. Something I noticed mine doing that just does not seem right. With single center focus point selected, one shot mode, I find that the camera will sometimes give focus confirmation when there is clearly nothing in focus. For example I was using single point on a drop of rain at the end of a needle on a pine. There was clear contrast however the camera hunted back and forth quickly for just a second and then gave focus confirmation, however it was clear that absolutely nothing in the scene was in focus.
I honestly cannot remember any of my previous Canon bodies doing this. They may hunt and then finally get focus or just continue to hunt. Is there a setting that would prevent this? I have read the book, watched the videos, read another book written for the 7D. I can find no explanation. ...Show more →
Mine does the exact same thing as well. It's currently on it's second trip back to Canon for AF inconsistencies. Hopefully this anomaly will be fixed this time in, or at least in a future firmware upgrade. I can get mine to focus like like this without much effort (neighbor's tile roof), so I'll know if it's fixed within a day of being back. And hopefully Zone AF is fixed this time as well....
Packing mine up now for its second time back. This 7D experience has been poor to say the least.
In One Shot mode > Single AF point (center) > Focus Search ON.. I would expect the camera to continue searching for focus rather than report focus obtained when there is clearly nothing in focus. I think this is the reason for some shots, not just my own, that come out with nothing in focus, when the shutter speed is clearly high enough to take care of handheld blur. Not to mention this happens on a tripod as well.
Awesome pics. Foxes are so beautiful.......We have a few around here, but hard to actually catch them out. It's kind of hit and miss. U did a fabulous job with the pictures.
I was asked about this so jsut posting here for archival purposes.
Here these sites state the shutter lag etc of the 1D cameras and also the 7D specs. I'm not making up stuff.
"Shutter Priorities"
"Responsiveness and user-directed adaptability are clearly demonstrated in the range of the Mark II camera's shutter speeds — from 30 seconds to 1/8000, plus bulb (with user-set adjustments of 1/3, 1/2, or full stops). Maintaining (and contributing to) the camera's high-speed capabilities, the EOS-1D Mark II camera has a shutter lag time of just 55ms (adjustable to as little as 40ms via a new personal function) and the mirror "black out" time is approximately 87ms at 1/60 or faster shutter speeds, resulting in easy viewing even during high-speed shooting at 8.5 fps."
I have seen some conflicting results on diff reviews of the 7D timings, some say it's slightly slower than the 1D times and some reviews say it's double the times, none say it's the same though. Be wary of any 7D review stating the viewfinder black out time of a 7D as it does not actually black out the viewfinder so this is impossible to time on a 7D. lol
7D : http://www.imaging-resource.com/PRODS/E7D/E7DA6.HTM
0.4 second / 400 ms - Power on to first shot
0.131 second / 131 ms - Shutter release time lag approx. Single Shot
0.061 second / 61 ms - Shutter release time lag approx. Prefocused
0.127 second / 127 ms - Shutter release time lag approx. Continuous AF
10 seconds / 10000 ms - Buffer clearing time 16 RAW files
0.4 second / 400 ms - Display recorded image
1.2 second / 1200 ms - Record to play
800 - Lithium-ion Rechargeable Battery
30MB - RAW File Size: 5,184x 3,4564
The Canon 7D's full autofocus shutter response is excellent at 131 ms second using our standard single-point AF test, the same lag as the 50D. Full 19-point auto select AF only slowed to 149 ms.
1D MK III : http://www.imaging-resource.com/PRODS/E1DMK3/E1DMK3A6.HTM
0.1 second / 100 ms - Power on to first shot
0.094 second / 90 ms - Shutter release time lag approx. Single Shot
0.057 second / 60 ms - Shutter release time lag approx. Prefocused
0.087 second / 90 ms - Shutter release time lag approx. Continuous AF
30 secs 30,000 ms - Buffer clearing time 6 RAW files - Ouch!
50 seconds 50,000 ms - Buffer clearing time 20 RAW + LF JPEG - Ouch!
0.4 second / 400 ms - Display recorded image
1.1 second / 1100 ms - Record to play
2,200 - Lithium-ion Rechargeable Battery
15MB - RAW File Size: 3,888 x 2,592
There was quite a bit of variation of Full AF shutter response, ranging from 80 ms to 20 ms.
Shutter Lag | VF Blackout
Canon EOS Digital Rebel XS / 1000D 90ms
Canon EOS Digital Rebel T1i / 500D 90ms 130ms
Canon EOS Digital Rebel XSi / 450D 90ms 130ms
Canon EOS Digital Rebel XTi / 400D 100ms 170ms
Canon EOS Digital Rebel XT / 350D 100ms 170ms
Canon EOS 50D 59ms 100ms
Canon EOS 40D 59ms 100ms
Canon EOS 30D 65ms 110ms
Canon EOS 20D 65ms 115ms
Canon EOS 7D 59ms 100ms
Canon EOS 5D Mark II 73ms 145ms
Canon EOS 5D 75ms 145ms
Canon EOS 1D Mark IV 40-55ms 80ms
Canon EOS 1D Mark III 40-55ms 80ms
Canon EOS 1D Mark II N 40-55ms 87ms
Canon EOS 1DS Mark III 40-55ms 80ms
Canon EOS 1DS Mark II 40-55ms 87ms
