Paulo Eduardo Uchoa Posted June 2, 2010 Share Posted June 2, 2010 I just finished a short film using the canon 5d and one thing that I noticed was that I would measure the distance from camera to subject, match it with the lens then I would double check the focus by using the zoom feature and I found out that I was always off by just a tiny bit. So I am wondering if using the zoom feature makes it seem like I'm doing an imax kinda focus check. Link to comment Share on other sites More sharing options...
Premium Member Hal Smith Posted June 2, 2010 Premium Member Share Posted June 2, 2010 I just finished a short film using the canon 5d and one thing that I noticed was that I would measure the distance from camera to subject, match it with the lens then I would double check the focus by using the zoom feature and I found out that I was always off by just a tiny bit. So I am wondering if using the zoom feature makes it seem like I'm doing an imax kinda focus check. As a rule, still camera zoom lenses are not parfocal, they do not hold focus as the focal length is varied. The Canon EF/EF-S series zooms seem to be better than many others but still not absolutely parfocal. http://en.wikipedia.org/wiki/Parfocal Link to comment Share on other sites More sharing options...
Mei Lewis Posted June 2, 2010 Share Posted June 2, 2010 Perhaps Paul means the x5 and x10 digital zoom mofe in live view, whic is intended solely for focussing? Link to comment Share on other sites More sharing options...
Paulo Eduardo Uchoa Posted June 6, 2010 Author Share Posted June 6, 2010 Perhaps Paul means the x5 and x10 digital zoom mofe in live view, whic is intended solely for focussing? Yes this is the feature that I am talking about. I think is Hal is right about the still lenses, I should do a real test with a PL mounted adapter Link to comment Share on other sites More sharing options...
Premium Member Chris Keth Posted June 7, 2010 Premium Member Share Posted June 7, 2010 Yes this is the feature that I am talking about. I think is Hal is right about the still lenses, I should do a real test with a PL mounted adapter That zoom feature is just a digital zoom in to what is being recorded (but not greater than 1:1). If you're off for that you're soft, period. I don't know your exact rig but with a 5D there's a very good chance that the FFD is off or that your lenses don't tape out properly. Link to comment Share on other sites More sharing options...
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