Depth of field
Jul 26, 2022 12:20:44 #
Sorry, I oversimplified it. I assumed the f-stops would need to be the same and subject distance and focal points would need to be the same.
Jul 26, 2022 12:29:22 #
It's complicated. Take a look at these lens simulators.
https://www.sigma-imaging-uk.com/focal-length-simulator/
http://imaging.nikon.com/lineup/lens/simulator/
https://hisgallery.com/blog/collection-of-online-camera-simulators-lens-simulators
http://canonfeatures.ca/comparison-tool
https://www.diyphotography.net/use-nikons-lens-simulator-to-pick-your-next-lens-non-nikon-shooters-too/
Actually, it's called "apparent depth of field" because the sharpness if just about the same whether it's a W/A or a tele.
http://www.joeenglander.com/documents/depth.pdf
https://blog.samys.com/myth-depth-field/
https://photographylife.com/what-is-depth-of-field
https://www.sigma-imaging-uk.com/focal-length-simulator/
http://imaging.nikon.com/lineup/lens/simulator/
https://hisgallery.com/blog/collection-of-online-camera-simulators-lens-simulators
http://canonfeatures.ca/comparison-tool
https://www.diyphotography.net/use-nikons-lens-simulator-to-pick-your-next-lens-non-nikon-shooters-too/
Actually, it's called "apparent depth of field" because the sharpness if just about the same whether it's a W/A or a tele.
http://www.joeenglander.com/documents/depth.pdf
https://blog.samys.com/myth-depth-field/
https://photographylife.com/what-is-depth-of-field
Jul 26, 2022 12:33:02 #
Gdelvecc wrote:
Sorry, I oversimplified it. I assumed the f-stops would need to be the same and subject distance and focal points would need to be the same.
Most of us understood that you meant to include that.
For an in-depth look at the subject see the DEPTH OF FIELD CALCULATOR at Cambridge in Colour. Click on "Show advanced" to see all of the things that can affect DOF.
The first three variables are usually left out of the discussion.
Jul 26, 2022 12:45:52 #
selmslie wrote:
Most of us understood that you meant to include that.
For an in-depth look at the subject see the DEPTH OF FIELD CALCULATOR at Cambridge in Colour. Click on "Show advanced" to see all of the things that can affect DOF.
The first three variables are usually left out of the discussion.
For an in-depth look at the subject see the DEPTH OF FIELD CALCULATOR at Cambridge in Colour. Click on "Show advanced" to see all of the things that can affect DOF.
The first three variables are usually left out of the discussion.
Exactly right. That’s why my previous post said “acceptable circle of confusion”.
Jul 26, 2022 12:48:08 #
delder
Loc: Maryland
Has been mentioned on UHH before, Optic design for ZOOM lenses is FAR more complex than a fixed focus lens.
Lots of moving parts and interrelationships between elements in ZOOM lens design.
Easier to optimize a single focal length lens.
Lots of moving parts and interrelationships between elements in ZOOM lens design.
Easier to optimize a single focal length lens.
Jul 26, 2022 15:14:29 #
They should be. In fact, depth of field is not affected by focal length by any real significance.
--Bob
--Bob
Gdelvecc wrote:
Is the depth of field the same for a 35mm prime lens as a 17-70mm zoom set at 35mm??? Thanks in advance…
Jul 26, 2022 15:54:42 #
TriX wrote:
Yes, assuming the same aperture, distance to subje... (show quote)
Sensor size ? What about body color ?
Sensor size does NOT matter cuz it is not a variable. Likewise body color. The only variable in question is the lenses. The OP presents only one variable.
Jul 26, 2022 16:17:12 #
User ID wrote:
Sensor size ? What about body color ?
Sensor size does NOT matter cuz it is not a variable. Likewise body color. The only variable in question is the lenses. The OP presents only one variable.
Sensor size does NOT matter cuz it is not a variable. Likewise body color. The only variable in question is the lenses. The OP presents only one variable.
CoC IS a variable and sensor size IS a key component of CoC. You need to read the Wiki link I published above (or just note that sensor size is a component in any DOF calculator - surely you know that - photography 101).
Jul 26, 2022 16:23:41 #
TriX wrote:
CoC IS a variable and sensor size IS a key component of CoC. You need to read the Wiki link I published above (or just note that sensor size is a component in any DOF calculator - surely you know that - photography 101).
You can recite all the science you wish. But if you read the OP there is only one variable. Mentioning variables not in question is pointless. A lens swap is the sole variation in question.
Jul 26, 2022 16:38:47 #
User ID wrote:
You can recite all the science you wish. But if you read the OP there is only one variable. Mentioning variables not in question is pointless. A lens swap is the sole variation in question.
You got a problem with science?
Jul 26, 2022 16:43:31 #
User ID wrote:
ROTFLMFAO
Imaginary differences defined by geeks. Best approach is to unsee it.
Imaginary differences defined by geeks. Best approach is to unsee it.
As the popular saying goes, "It's like a train wreck. You can't look away."
Jul 26, 2022 16:48:26 #
User ID wrote:
Sensor size does NOT matter cuz it is not a variable. ... The OP presents only one variable.
At a minimum there are four variables: sensor size, aperture, focal length and focus distance.
That leave out print (image) size, viewing distance and visual acuity - three more.
That's seven variables. Any of them can have a different value. That's why we call them variables.
Even if you assume any of them remains constant all seven are still variables.
Jul 26, 2022 17:33:13 #
Gdelvecc wrote:
Is the depth of field the same for a 35mm prime lens as a 17-70mm zoom set at 35mm??? Thanks in advance…
If all settings are the same, yes. Quality, which is what some are talking about, may be different, but 35 is 35 is 35.
Jul 26, 2022 17:44:02 #
Gdelvecc wrote:
Is the depth of field the same for a 35mm prime lens as a 17-70mm zoom set at 35mm??? Thanks in advance…
Strictly speaking in perfect world and in theory YES - in the real/practical world there can be a very small variance which should be mostly un-noticed.
.
Jul 27, 2022 02:14:55 #
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