November 28, 2014, 08:44:45 AM

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Topics - Bigjezza

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EOS Bodies - For Stills / 7DMKII Focus keeper rate ideas?
« on: November 24, 2014, 04:21:32 AM »
Hi,
I have a 7D MKII. Let me just start with the fact that I understand that no AF is perfect. I also understand that f1.4. 2.8etc have a very small DOF

I've found that shooting one shot mode at a piece of typewritten paper in direct sunlight 50mm f1.4 I can expect maybe 7 or 8 out of 10 in focus at 100% (admittedly the 50mm 1.4 isn't razor sharp at that aperture) Is this to be expected? When viewed on a 28" 4K display other shots look fine until I get to about a 5CM of the display, and notice the focus is a bit off. Even with my 24-70 (Mark I) at 2.8 its maybe 70-90% spot on. Of course I didn't record my findings, just a casual chimp at the images and review on the screen.

Is it normal to think that at casual print sizes, maybe even upto 13X19, the oneshot AF is OK, but if I want to pixel peep or print bigger I'm better off MF with live view?

I went to the trouble of doing the test after I found it extremely difficult to get the iris/pupil in focus consistently. In fact with my kids I seem to get better results with AI Servo. Any tips there?

Howabout sports/action with a 70-200mm f2.8 IS USM II. Any idea on the keeper rate there? A number for me to strive to? I took it out the other day to the kids sports day and in AI Servo atleast 80% were great. Is that something to be proud/worried about??

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