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#1
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Depth of Field
Colleagues: I'm looking for an easy, arithmetic way to determine the amount
of an image that is in focus. What would be really nice would be a spreadsheet or chart that says (for example) at f/4 with the camera focused at an object 6 feet away, everything from 5 feet to 7 feet is sharp. And then at f/8, everything from 2 feet to 24 feet is sharp. Etc. Is there a formula or a reference resource like this somewhere? TIA, ~Ray |
#2
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Depth of Field
On Jan 23, 9:48*am, Ray Paseur
wrote: Colleagues: I'm looking for an easy, arithmetic way to determine the amount of an image that is in focus. *What would be really nice would be a spreadsheet or chart that says (for example) at f/4 with the camera focused at an object 6 feet away, everything from 5 feet to 7 feet is sharp. *And then at f/8, everything from 2 feet to 24 feet is sharp. *Etc. Is there a formula or a reference resource like this somewhere? TIA, ~Ray http://www.dofmaster.com/dofjs.html http://www.bobatkins.com/photography...l/dofcalc.html http://www.cambridgeincolour.com/tut...calculator.htm |
#3
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Depth of Field
"JimKramer" wrote: On Jan 23, 9:48 am, Ray Paseur wrote: Colleagues: I'm looking for an easy, arithmetic way to determine the amount of an image that is in focus. What would be really nice would be a spreadsheet or chart that says (for example) at f/4 with the camera focused at an object 6 feet away, everything from 5 feet to 7 feet is sharp. And then at f/8, everything from 2 feet to 24 feet is sharp. Etc. Is there a formula or a reference resource like this somewhere? TIA, ~Ray http://www.dofmaster.com/dofjs.html http://www.bobatkins.com/photography...l/dofcalc.html http://www.cambridgeincolour.com/tut...calculator.htm I think I just figured out why all my birds wear little fur coats... :O) Have fun, Dave |
#4
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Depth of Field
DaveS wrote:
"JimKramer" wrote: On Jan 23, 9:48 am, Ray Paseur wrote: Colleagues: I'm looking for an easy, arithmetic way to determine the amount of an image that is in focus. What would be really nice would be a spreadsheet or chart that says (for example) at f/4 with the camera focused at an object 6 feet away, everything from 5 feet to 7 feet is sharp. And then at f/8, everything from 2 feet to 24 feet is sharp. Etc. Is there a formula or a reference resource like this somewhere? TIA, ~Ray http://www.dofmaster.com/dofjs.html http://www.bobatkins.com/photography...l/dofcalc.html http://www.cambridgeincolour.com/tut...calculator.htm I think I just figured out why all my birds wear little fur coats... :O) LOL! |
#5
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Depth of Field
"Paul Furman" wrote:
DaveS wrote: "JimKramer" wrote: On Jan 23, 9:48 am, Ray Paseur wrote: Colleagues: I'm looking for an easy, arithmetic way to determine the amount of an image that is in focus. What would be really nice would be a spreadsheet or chart that says (for example) at f/4 with the camera focused at an object 6 feet away, everything from 5 feet to 7 feet is sharp. And then at f/8, everything from 2 feet to 24 feet is sharp. Etc. Is there a formula or a reference resource like this somewhere? TIA, ~Ray http://www.dofmaster.com/dofjs.html http://www.bobatkins.com/photography...l/dofcalc.html http://www.cambridgeincolour.com/tut...calculator.htm I think I just figured out why all my birds wear little fur coats... :O) LOL! Here, I'll give you more fodder... To cure my "furry bird" syndrome, I went out and got 1.4x teleconvertor for my 70-300 lens. I haven't taken an in focus shot since. Now I think I know why. Stupid P button... Soon, I shall Hawks like yours! :O) Have fun, Dave |
#6
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Depth of Field
Good question, but it's not that simple (circle of confusion and all that).
It depends on the size of the final image too. Do you have DOF markers on your lens? If so, this will give you a rough guide Also worth noting that if you are using big aperture lenses, what you see through the viewfinder is not necessarily true. "Ray Paseur" wrote in message ... Colleagues: I'm looking for an easy, arithmetic way to determine the amount of an image that is in focus. What would be really nice would be a spreadsheet or chart that says (for example) at f/4 with the camera focused at an object 6 feet away, everything from 5 feet to 7 feet is sharp. And then at f/8, everything from 2 feet to 24 feet is sharp. Etc. Is there a formula or a reference resource like this somewhere? TIA, ~Ray |
#7
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Depth of Field
JimKramer wrote in
: On Jan 23, 9:48*am, Ray Paseur wrote: Colleagues: I'm looking for an easy, arithmetic way to determine the amoun t of an image that is in focus. *What would be really nice would be a spreadsheet or chart that says (for example) at f/4 with the camera focuse d at an object 6 feet away, everything from 5 feet to 7 feet is sharp. *An d then at f/8, everything from 2 feet to 24 feet is sharp. *Etc. Is there a formula or a reference resource like this somewhere? TIA, ~Ray http://www.dofmaster.com/dofjs.html http://www.bobatkins.com/photography...l/dofcalc.html http://www.cambridgeincolour.com/tut...calculator.htm Cool! Thanks. |
#8
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Depth of Field
Answer: Kodak Master Photoguide
Kodak produced cardboard devices with a cardboard dial that could be set to focal length, f number and dustance. Kodak produced them for about 50 years. You probably can find a used more recent Kodak Master Photoguide which may contain a Depth of Field chart in it. "Ray Paseur" wrote in message ... Colleagues: I'm looking for an easy, arithmetic way to determine the amount of an image that is in focus. What would be really nice would be a spreadsheet or chart that says (for example) at f/4 with the camera focused at an object 6 feet away, everything from 5 feet to 7 feet is sharp. And then at f/8, everything from 2 feet to 24 feet is sharp. Etc. Is there a formula or a reference resource like this somewhere? TIA, ~Ray |
#9
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Depth of Field
On Jan 23, 9:48 am, Ray Paseur
wrote: Colleagues: I'm looking for an easy, arithmetic way to determine the amount of an image that is in focus. What would be really nice would be a spreadsheet or chart that says (for example) at f/4 with the camera focused at an object 6 feet away, everything from 5 feet to 7 feet is sharp. And then at f/8, everything from 2 feet to 24 feet is sharp. Etc. Is there a formula or a reference resource like this somewhere? TIA, ~Ray This hurts my memory to reconstruct the thoughts, but IIRC, when you study the DOF charts you come to a startling revelation. You think of telephotos as having shallow DOF and short lenses as having relatively bigger DOF, but in reality, they have the same DOF. Say you shoot a scene with a 300mm lens. Then you take off the lens, and put on a 28mm lens. You walk forward until you have exactly the same framing (and you are using the same f-stop). What you find is the same DOF. It's one of those "strange but true" things. Anyway, good luck with your DOF project, whatever it may be. |
#10
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Depth of Field
On Jan 24, 4:29 am, Pat wrote:
On Jan 23, 9:48 am, Ray Paseur wrote: Colleagues: I'm looking for an easy, arithmetic way to determine the amount of an image that is in focus. What would be really nice would be a spreadsheet or chart that says (for example) at f/4 with the camera focused at an object 6 feet away, everything from 5 feet to 7 feet is sharp. And then at f/8, everything from 2 feet to 24 feet is sharp. Etc. Is there a formula or a reference resource like this somewhere? TIA, ~Ray This hurts my memory to reconstruct the thoughts, but IIRC, when you study the DOF charts you come to a startling revelation. You think of telephotos as having shallow DOF and short lenses as having relatively bigger DOF, but in reality, they have the same DOF. Say you shoot a scene with a 300mm lens. Then you take off the lens, and put on a 28mm lens. You walk forward until you have exactly the same framing (and you are using the same f-stop). What you find is the same DOF. It's one of those "strange but true" things. Anyway, good luck with your DOF project, whatever it may be. That's true, if you frame the same, and use the same f/stop, you get the same depth of field (to within some limits, I imagine, but maybe not). Easy enough to test if you have a zoom lens. I think the reason most of us find this surprising is that we use different focal length lenses in different ways, so never get to notice it. |
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