This is a brief excerpt from NoFilmSchool
There have been a number of reports regarding the Blackmagic Cinema Camera and getting proper infinity focus with quite a few lenses. Earlier in the month we showed you a few videos documenting the issue, and Blackmagic so far has been very responsive, telling us at that point that they were looking into the issue. We now have a solution straight from the company, and it looks like it’s going to be a hardware fix if your camera has already been delivered.
Here was the issue, along with one of the worst offenders so far, the Tokina 11-16mm lens:This was posted by Krisitan Lam in the Blackmagic Forum:
I want to give you an update about this issue.
The cameras are all shimmed and calibrated to 44mm as per the reported focal flange depth of EF mount. I use the term “reported” as Canon does not publish the specifications officially so the exact expected tolerances are not known.
When checked against a collimated cine lens, we expect the Blackmagic Cinema Camera to get accurate focus according to the witness marks on the lens. For example, at focus chart placed 6 ft from the camera sensor plane will be …
By: Joe Marine
via planet5D pinterest news http://pins.planet5d.com/blackmagic-solves-infinity-focus-issue-with-cinema-camera-will-require-hardware-fix/
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