BrianO wrote: yauyi wrote: ...average about 8 out of 10 shots are OOF, they weren\'t front or back focus....simply out of focus.
I\'m not sure what you mean here; an OOF subject must be the result of the focus being either in front of or behind the subject plane; if it were neither front focused or back focused, then it would be focused.
As for why this is happening, I suspect it has more to do with how much of the frame is filled with the subject, rather than the actual distance to the subject.
Another possibility is that you\'re tripping the shutter before focus has been fully achieved; the 85L has a lot of massive glass to move during focusing. That would be affected by distance, and longer distances could slow things down a bit.
What focus mode and focus point settings are you using?
I get the focus confirmatin beep before pressing the shutter though. was using single shot with center AF point. I thought on longer distance subject the bigger DOF would have enough coverage to get the subject\'s face in focus...since there\'s where I aim at, no?
Kolor-Pikker wrote:
Seeing as you\'re using a 5D2... you weren\'t using any points other than the center point, were you? The outer points aren\'t very reliable, it\'s probably better just to focus & recompose.
I\'ve now gotten in the habit of using the \"sports shooter\'s\" layout with the camera in AI servo and using the AF-on button to focus as it makes the 85L more manageable. Continuous shooting is a good idea too.
And do you have an Eg-S focusing screen as well? The standard focusing screen in most cameras lets you see the effects of DoF only down to f/2.5, so a percision screen is very recommended for fast primes, especially the 85L.
I would have to give AI Servo a try on longer distance subject and see if it helps and look into the Eg-S focusing screen....
Tdizzle wrote:
Have you microadjusted the lens? Might help, certainly would not hurt!
I had to dial in +8 MA for close up shots, could this throw off the long distance stuff?
martsmith42 wrote: The outer points aren\'t very reliable, it\'s probably better just to focus & recompose.
There is a steep learning curve with the 85 f1.2. You can\'t focus and recompose at f1.2 as it will result in oof shoots. the d.o.f is toooo shallow
according to the DOF calculator, 15ft @f/1.2 I\'d get 0.67ft DOF....which is significantly greater than at 5ft subject distance with only 0.07ft DOF...
Jul 02, 2010 at 01:00 PM
Previous versions of yauyi's message #8623401 « 85L II unrealistic expectation? »
