Daniel Madsen Posted February 5, 2007 Share Posted February 5, 2007 what are the circle of confusions for 1/4, 1/3, 1/2in CCDs? hope someone has an answer Link to comment Share on other sites More sharing options...
K Borowski Posted February 5, 2007 Share Posted February 5, 2007 Well, it depends on your acceptable sharpness, intended viewing size, and the lens you are using. There's a mathematical formula I have in an old Naval Photography guide at home somewhere. If you give me the area of each of those sensors, I could probably figure it out using the formula. As a rule, the smaller the chip, the greater the depth of field, and the greater amount of leeway you have with focus. ~Karl Link to comment Share on other sites More sharing options...
Daniel Christie Posted February 11, 2007 Share Posted February 11, 2007 The CCD size is not actually representative of the image size. There was a discussion of this in another forum awhile back... I'll see if I can find it. Daniel Link to comment Share on other sites More sharing options...
Premium Member Chris Keth Posted February 12, 2007 Premium Member Share Posted February 12, 2007 For chip sizes, figure out the actual size of a pixel on the chip. That should be your CoC since anything smaller will just be represented by that pixel. Perhaps go with 1/2 the pixel size to be safe. Link to comment Share on other sites More sharing options...
George White Posted February 12, 2007 Share Posted February 12, 2007 For chip sizes, figure out the actual size of a pixel on the chip. That should be your CoC since anything smaller will just be represented by that pixel. Perhaps go with 1/2 the pixel size to be safe. I think its more (and and also less) complicated than that. There is a huge amount of information about depth of field on the net. I found this article http://www.bealecorner.com/trv900/dof.html that specifically addresses it for various size video sensors. I'm sure with a little digging you can find a better site and all the information on the topic you'd like. ---george Link to comment Share on other sites More sharing options...
Will Earl Posted February 12, 2007 Share Posted February 12, 2007 Panavision has the CoC ranging from 0.008mm (1/4") to 0.021mm (2/3") for the CCD sizes you mentioned. http://www.panavision.co.nz/main/kbase/ref...calcFOVform.asp Unsure how accurate it is through. Probably a decent starting point. Link to comment Share on other sites More sharing options...
Premium Member Chris Keth Posted February 12, 2007 Premium Member Share Posted February 12, 2007 I think its more (and and also less) complicated than that. There is a huge amount of information about depth of field on the net. I found this article http://www.bealecorner.com/trv900/dof.html that specifically addresses it for various size video sensors. I'm sure with a little digging you can find a better site and all the information on the topic you'd like. ---george I realize that is a very unscientific way to look at it but it will probably estimate your actual visual depth of field better than any of the formulas based on chip size and viewing size. Those will tend to underestimate the depth of field since they are for sensors of unlimited resolving power (i.e. they don't take resolving power into account) Compare 16mm film and an equivalent size SD chip. They will have the same calculated DoF but very different visually apparent DoF since the chip's ability to render fine changes in focus is so limited. Link to comment Share on other sites More sharing options...
Leo Anthony Vale Posted February 15, 2007 Share Posted February 15, 2007 Panavision has the CoC ranging from 0.008mm (1/4") to 0.021mm (2/3") for the CCD sizes you mentioned. http://www.panavision.co.nz/main/kbase/ref...calcFOVform.asp Unsure how accurate it is through. Probably a decent starting point. Circle of Confusion is an arbitrary number based partially on how large the imaged will be magnifyed. http://en.wikipedia.org/wiki/Circle_of_confusion http://www.nikonlinks.com/unklbil/dof.htm Link to comment Share on other sites More sharing options...
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