Timeline for Sensor size, reducers / teleconverters, and DOF
Current License: CC BY-SA 4.0
14 events
| when toggle format | what | by | license | comment | |
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| Feb 25, 2022 at 20:06 | comment | added | Michael C | Depth of Focus is just the image side conjugate of Depth of Field, which is measured on the object (subject) side of the lens. They are essentially the same thing in reverse. | |
| Feb 24, 2022 at 16:42 | history | edited | Steven Kersting | CC BY-SA 4.0 |
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| Feb 24, 2022 at 16:34 | history | edited | Steven Kersting | CC BY-SA 4.0 |
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| Feb 24, 2022 at 15:17 | history | edited | Steven Kersting | CC BY-SA 4.0 |
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| Feb 24, 2022 at 15:11 | vote | accept | zakray | ||
| Feb 24, 2022 at 15:11 | comment | added | zakray | Yeah sorry I didn't mean to make you watch the whole thing. Much appreciate your explanation though, I think I finally get it. | |
| Feb 24, 2022 at 14:25 | history | edited | Steven Kersting | CC BY-SA 4.0 |
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| Feb 24, 2022 at 14:16 | history | edited | Steven Kersting | CC BY-SA 4.0 |
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| Feb 24, 2022 at 14:11 | comment | added | Steven Kersting | I really didn't want to go watch that video; but I quickly skimmed. Basically, what he is talking about by not taking the CoC into factor is the depth of focus and not the depth of field. Or to put it another way, because he cropped the FF sensor much harder (much greater magnification) in order to get the same remaining image as the 4/3, he created the same DoF in the end result... in this case the original format CoC is not applicable because that relates to enlarging the whole image area; they would instead have the same CoC limit because they are the same portion of the image. | |
| Feb 24, 2022 at 5:12 | comment | added | zakray | So you would agree not taking CoC into account is the reason their test is flawed? | |
| Feb 24, 2022 at 3:00 | comment | added | Michael C | Depth of field has nothing to do with bokeh circles, it has to do with circles of confusion. Even at the sharpest point of focus the lens can never theoretically project a point (because lenses have real thickness), it can only project a very small blur circle. How large this blur circle can be before it no longer looks like a point to our eyes is what we call the circle of confusion. How far in front of and behind the point of sharpest focus the blur stays small enough to look sharp is what determines DoF. | |
| Feb 24, 2022 at 2:22 | comment | added | zakray | I think where I got tripped up is that in the YouTube video, they change to a larger sensor and then zoom in to replicate the field of view of the smaller sensor. Because the "bokeh circles" are the same size they conclude the DOF is the same. But what you're saying is if you didn't zoom in, the circles would be smaller and therefore closer to the CoC, resulting in a wider DOF. Is that right? | |
| Feb 23, 2022 at 18:37 | history | edited | Steven Kersting | CC BY-SA 4.0 |
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| Feb 23, 2022 at 18:31 | history | answered | Steven Kersting | CC BY-SA 4.0 |