Stephen Whitehead Posted June 18, 2005 Share Posted June 18, 2005 Hey, does anyone know where about a depth of field chart for HD, namely the CineAlta can be found? Cheers, Steve Link to comment Share on other sites More sharing options...
Mike Brennan Posted June 18, 2005 Share Posted June 18, 2005 Hi Steven, I suggest that you make your own notes. In doing so you'll learn how the focus falls off slowly especially on wider lenses and the effect of in-camera detail on out of focus backgrounds. 1920x1080 LCD display should do the trick for you. Mike Brennan Link to comment Share on other sites More sharing options...
Stephen Whitehead Posted June 18, 2005 Author Share Posted June 18, 2005 Now I am familier of course with wider angle lenses' effects on DOF. My thing is that I have worked mostly with 35mm, and 16mm and now am being asked to shoot HD. What exactly do you mean by the cameras effect on background detail? is there some sort of filter that the camera applies? Cheers, Steve Link to comment Share on other sites More sharing options...
Dudu Stoz Posted June 20, 2005 Share Posted June 20, 2005 the DOF calculation on HD are the same as with film exept circle of confusion is 15 micron. Link to comment Share on other sites More sharing options...
Dudu Stoz Posted June 20, 2005 Share Posted June 20, 2005 In doing so you'll learn how the focus falls off slowly especially on wider lenses and the effect of in-camera detail on out of focus backgrounds. Mike Brennan <{POST_SNAPBACK}> sorry, but the in camera detail has nothing to do with soft focus in the background(or in the forgound) it is the electronic detail enhancing of sharp objects - to be precice the detail enhancing circle drowin black an white lines arround lines where video level or croma vector changes radicaly. Link to comment Share on other sites More sharing options...
Premium Member Stephen Williams Posted June 20, 2005 Premium Member Share Posted June 20, 2005 sorry, but the in camera detail has nothing to do with soft focus in the background(or in the forgound) it is the electronic detail enhancing of sharp objects - to be precice the detail enhancing circle drowin black an white lines arround lines where video level or croma vector changes radicaly. <{POST_SNAPBACK}> Hi, However too much detail will make everything look sharper. If you have good lenses you should be able to turn off the detail! Stephen Link to comment Share on other sites More sharing options...
Dudu Stoz Posted June 20, 2005 Share Posted June 20, 2005 If you have good lenses you should be able to turn off the detail! Stephen <{POST_SNAPBACK}> well for my opinion the detail enhancment is good for anything to be broadcast in television, with detail off it will look too soft even with a sharp lens - but for anything going to teathral release the detail correction is too visible so it is better to turn it off as you said Link to comment Share on other sites More sharing options...
Premium Member Stephen Williams Posted June 21, 2005 Premium Member Share Posted June 21, 2005 well for my opinion the detail enhancment is good for anything to be broadcast in television, with detail off it will look too soft even with a sharp lens - but for anything going to teathral release the detail correction is too visible so it is better to turn it off as you said <{POST_SNAPBACK}> Hi, We are talking about a Cine Alta camera! The Panavision default is off as no extra detail is required as the lenses are so sharp. But for a video camera with a cheap zoom lens, well thats another story. Stephen Link to comment Share on other sites More sharing options...
Mike Brennan Posted June 21, 2005 Share Posted June 21, 2005 sorry, but the in camera detail has nothing to do with soft focus in the background(or in the forgound) <{POST_SNAPBACK}> Nothing to do with soft background? Try it and see if it has no effect on the background. Mike Brennan Link to comment Share on other sites More sharing options...
Mike Brennan Posted June 21, 2005 Share Posted June 21, 2005 the DOF calculation on HD are the same as with film exept circle of confusion is 15 micron. <{POST_SNAPBACK}> It is dangerous quoting depth of field numbers made for film. Although the theory of optics is the same, HD capture and display is different than film, for which the depth of field charts were designed (someone correct me if I'm wrong here) The "apparent" depth of field decreases with the resolution of the display. So it could be less on HD, when viewed on a HD display or digital projector than on 16mm projected on film. Ask yourself, Who created the depth of field tables? captured on what medium? and viewed on what display? Mike Brennan Link to comment Share on other sites More sharing options...
Premium Member David Mullen ASC Posted June 21, 2005 Premium Member Share Posted June 21, 2005 The "apparent" depth of field decreases with the resolution of the display.So it could be less on HD, when viewed on a HD display or digital projector than on 16mm projected on film. Ask yourself, Who created the depth of field tables? captured on what medium? and viewed on what display? Mike Brennan <{POST_SNAPBACK}> Now you understand why I believe depth of field charts will always only be an approximation anyway. Too many variables, too many end product destinations. Anything that is critical should be tested for the worst-case final viewing format, otherwise just understand that it's only a ballpark calculation. Link to comment Share on other sites More sharing options...
Dudu Stoz Posted June 22, 2005 Share Posted June 22, 2005 Anything that is critical should be tested for the worst-case final viewing format, otherwise just understand that it's only a ballpark calculation. <{POST_SNAPBACK}> 15 micron CoC calculation is the number that will suit for the worst-case viewing format. because unlike in film focus is not a defenitive thing it ranges within the size of the pixel which is ~ 14 micron in HDCAM - so if a dot of light sourse focuses inside 1 pixel it is no mather how big the screening projection will be, the dot will only fill this one pixel, which i think makes this DoF calculation a definitive thing. Link to comment Share on other sites More sharing options...
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