Pricewatch Deals / Re: Deals: EOS 6D, EF 24-70 f/2.8L II, EF 85 f/1.2L II, EF 70-200 f/4L IS via B&H Photo« on: December 05, 2013, 05:45:27 PM »
Mail-in-rebates don't work if you purchase from B&H and have it shipped to Canada, correct?
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May you sell with the in depth explanation.
If you are sure it an accurate test, this is not normal for this lens.
I have run the same test on several copies.
Most copies would be at the best around F/4 with almost no drop of at f/2.8.
Some copies would be sharpest at f/2.8.
The curve should remain almost level after f/4
I should mention that the test was conducted at:
- 70mm at 3.5 meters.
- Peak search before the test.
- EV 11.4
- Center point focus with evaluative metering.
When you run an aperture test it AF at the first, if it looses focus your results will look like this.
Make sure your viewfinder is covered. Check for possible vibration in your tripod.
Make sure you AFMA is correct. Make sure your target is the same height from floor as your camera, set up square and level.
Try it on both 5D II and 5D III bodies to see if you get the same results.