sarah cuming Posted May 19, 2010 Share Posted May 19, 2010 Am pulling focus on RED one cam, at 4k. This film may end up blown up to IMAX . Does any one know what Circle of Confusion I should work to? I generally use PCAm on the i-phone, but its at the menders! Thanks, Sarah Link to comment Share on other sites More sharing options...
Premium Member Chris Keth Posted May 19, 2010 Premium Member Share Posted May 19, 2010 Am pulling focus on RED one cam, at 4k. This film may end up blown up to IMAX . Does any one know what Circle of Confusion I should work to? I generally use PCAm on the i-phone, but its at the menders! Thanks, Sarah I normally work 4k red to a CoC of .00075". Since you may be going to imax, you might go a bit tighter to .0005". Link to comment Share on other sites More sharing options...
Chris Durham Posted August 4, 2010 Share Posted August 4, 2010 Hey Chris, I'm just wondering why you use .00075" for 4K as opposed to .001" which I believe a lot of people use for S35. If I understand correctly resolution shouldn't have so much to do with things as format with consideration also given to projection (which is why I could see giving a smaller circle of confusion for IMAX which, but for the larger projection, should have a larger acceptable CoC). Is it to accommodate for pixel pitch? Just wondering. I use smaller than .001" myself but that's basically to make sure my calculations are conservative. Link to comment Share on other sites More sharing options...
Premium Member John Sprung Posted August 4, 2010 Premium Member Share Posted August 4, 2010 The important thing here is that Circle of Confusion is a subjective decision -- there's no absolute right answer. So, the right approach is to shoot a diagonal newspaper test and look at it real big on a good 4K projector. Ideally, the DP would look at that test and make the decision. -- J.S. Link to comment Share on other sites More sharing options...
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