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Can You Name Five Things That Could Have Effected the Depth of Field In The Attached Image?
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Apr 7, 2021 17:36:42   #
Shooter41 Loc: Wichita, KS
 
While attempting to learn every way possible to control the Depth Of Field of an image, I took the attached picture of a Starling trying to get access to the beef suet in this bottom only feeder. I think I might have used five things to make the background in this image blurry to make the Starling stand out from the background. Earlier, I read somewhere that there are only three things that can have any effect on the Depth of Field of an image. Can anyone on UHH name five things that they think effects the Depth of Field of an image?


(Download)

Apr 7, 2021 17:55:52   #
fjdarling Loc: Mesa, Arizona, USA
 
aperture
focal length
distance from camera to subject
distance from subject to background
sensor crop factor

How did I do?

Apr 8, 2021 06:33:37   #
tcthome Loc: Keansburg , NJ
 
fjdarling wrote:
aperture
focal length
distance from camera to subject
distance from subject to background
sensor crop factor

How did I do?


I would of guessed the top 4 you have listed & admit I don't have know # 5.

 
 
Apr 8, 2021 07:25:12   #
R.G. Loc: Scotland
 
fjdarling wrote:
...distance from camera to subject...


More specifically it's distance from camera to focus point.

Apr 8, 2021 07:31:46   #
dpullum Loc: Tampa Florida
 
A bit off-topic regarding this excellent image, but somewhat related to DOF effects found in modern cameras:

My Panasonic TZ100 [and probably now also Canon and Sony] 1" sensor pocket 24/7 super zoom takes multishots "Post-focus" quickly so you can select focus and or combine.

These new modern cameras can also swallow swords, eat fire, and juggle kittens. What will come next?? ... Perhaps, we can stay at home and assign a photo-shoot and our drone will fly our camera there, make decisions, and complete the assignment, fly home and download to our computer which will use AI to peak the shots in post-processing... as we lounge in our reclining chair which also follows voice commands as does our ROKU TV control.

POSTFOCUS: "You can record bursts of photos with the same quality as a 4K photo while automatically changing the focus point ([Post Focus] recording). After recording, you can select a point on the screen to save a picture with that point as the focus point."

Apr 8, 2021 07:39:06   #
AlanW Loc: Upstate NY
 
Shooter41 wrote:
While attempting to learn every way possible to control the Depth Of Field of an image, I took the attached picture of a Starling trying to get access to the beef suet in this bottom only feeder. I think I might have used five things to make the background in this image blurry to make the Starling stand out from the background. Earlier, I read somewhere that there are only three things that can have any effect on the Depth of Field of an image. Can anyone on UHH name five things that they think effects the Depth of Field of an image?
While attempting to learn every way possible to co... (show quote)


Aperture, focal length and distance to subject are the 3 for any given camera. Sensor size would be a 4th. You can verify this in Photopills dof table calculator. Plug in camera model and focal length and it produces a dof chart for aperture/subject distance. While subject to background distance changes the focus in the image, it doesn't actually change the dof.

Alan

Apr 8, 2021 07:44:26   #
Revet Loc: Fairview Park, Ohio
 
It looks like a selection was made of the birdhouse so maybe number 5 is using Photoshop.

 
 
Apr 8, 2021 07:56:17   #
dpullum Loc: Tampa Florida
 
Revet wrote:
It looks like a selection was made of the birdhouse so maybe number 5 is using Photoshop.


Or perhaps one of the new AI programs or plugins rather than Photoshop. We live in a "Brave New World."
Example: skylum.com/luminar

Apr 8, 2021 08:09:07   #
User ID
 
By DESCENDING degree of efficacy:

1. Focus-Aperture Balance
2. Editing Software
3. Magical Thinking
4. Sunspot Activity
5. Focal Length

BTW, as a commercial image to sell bird feeders you did a real fine job. Plenty of smooth nearly blank background allows for adding text or clickable details. You have a leg up in the bird feeder biz :-)

Apr 8, 2021 08:34:11   #
par4fore Loc: Bay Shore N.Y.
 
Shooter41 wrote:
While attempting to learn every way possible to control the Depth Of Field of an image, I took the attached picture of a Starling trying to get access to the beef suet in this bottom only feeder. I think I might have used five things to make the background in this image blurry to make the Starling stand out from the background. Earlier, I read somewhere that there are only three things that can have any effect on the Depth of Field of an image. Can anyone on UHH name five things that they think effects the Depth of Field of an image?
While attempting to learn every way possible to co... (show quote)


Aperture
Focal length
Distance from camera focus point
Distance from subject to background
Photoshop

Apr 8, 2021 08:54:09   #
User ID
 
R.G. wrote:
More specifically it's distance from camera to focus point.


Very specifically Amen on that !

..................................................

Those who adhere too strictly to a DoF calculator can easily place their actual focus point in empty space, IOW on no object or detail at all :-(

In such cases, move the focus point to the subject and stop down even further (and cease worrying about diffraction).

 
 
Apr 8, 2021 09:22:57   #
David Martin Loc: Cary, NC
 
par4fore wrote:
Aperture
Focal length
Distance from camera focus point
Distance from subject to background
Photoshop

Atmospheric disturbance (e.g., heat waves)

Apr 8, 2021 09:40:56   #
User ID
 
David Martin wrote:
Atmospheric disturbance (e.g., heat waves)

Optically thaz not DoF, but it is a really cogent point as it applies to the overall perception of depth in the scene. Great that you brought it up.

In PP, when I slightly de-sharpen a background I also reduce its contrast and saturation as an imitation of the effect of “atmospheric perspective“. I never obliterate backgrounds but will often subtly fine tune them.

Apr 8, 2021 09:45:17   #
Guyserman Loc: Benton, AR
 
Comparing this picture to your recent 'Patience is a virtue' picture is very revealing.

Apr 8, 2021 09:45:25   #
Toment Loc: IL-FL
 
Shooter41 wrote:
While attempting to learn every way possible to control the Depth Of Field of an image, I took the attached picture of a Starling trying to get access to the beef suet in this bottom only feeder. I think I might have used five things to make the background in this image blurry to make the Starling stand out from the background. Earlier, I read somewhere that there are only three things that can have any effect on the Depth of Field of an image. Can anyone on UHH name five things that they think effects the Depth of Field of an image?
While attempting to learn every way possible to co... (show quote)

Beautiful shot! Topaz? too?😀

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