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DOF question
Aug 23, 2017 16:50:46 #
If I am shooting with a D7100 and my lens is a 105mm my F stop is 20 and my subject is about 4 to 5 feet away, how wide is my DOF. Thank you- still new to this.
Aug 23, 2017 16:53:52 #
http://www.dofmaster.com/dofjs.html
John Martin wrote:
If I am shooting with a D7100 and my lens is a 105mm my F stop is 20 and my subject is about 4 to 5 feet away, how wide is my DOF. Thank you- still new to this.
Aug 23, 2017 16:56:44 #
If you have a smart phone or tablet, you can find several programs for this in your app store. They are there for android and iPhone. Just search for DOF calculator. There should be several free ones and of course you can elect to purchase without adds.
Check out True Macro-Photography Forum section of our forum.
Aug 23, 2017 16:57:09 #
Aug 23, 2017 16:57:23 #
Aug 23, 2017 16:58:40 #
Aug 23, 2017 17:00:46 #
Check out Video for DSLR and Point and Shoot Cameras section of our forum.
Aug 23, 2017 17:07:09 #
It is surprising how short the zone of focus is (@ f20), isn't it? It is all a matter of magnification--close up, with longish lens. But if you back up or use shorter lens, to get more depth of field, your subject gets smaller--and if you crop it later, that reverses the savings and you lose dof back again. Try getting everything that needs to be sharp within the 1/3 ft sharpness plane--or stop down even more. Smaller stop will introduce a bit of softness in the minute details, but a lot depends on the subject. This sounds like macro work, which always must contend with short dof.
Aug 23, 2017 17:20:46 #
Thank you - lots to think about. I am entering into Marco with a lot to learn.
Aug 23, 2017 18:50:45 #
golferbob wrote:
Nikon APS-C Sensor
6.1"
Near Distance 4' 9.1"
Far Distance 5' 3.2"
6.1"
Near Distance 4' 9.1"
Far Distance 5' 3.2"
Correct for 5 ft, Rmalarz provided the DoF at 4 ft.
However, at the near and far limits the sharpness is barely passable. For critical focus, the DoF is about half of what the charts and calculators show. This is important for macro and if the OP is doing focus stacking.
Aug 23, 2017 20:02:29 #
Check out Photo Critique Section section of our forum.
Aug 24, 2017 05:22:43 #
John Martin wrote:
If I am shooting with a D7100 and my lens is a 105mm my F stop is 20 and my subject is about 4 to 5 feet away, how wide is my DOF. Thank you- still new to this.
Also, there are apps for that, and the camera's DOF preview button .
https://www.google.com/search?q=dof+apps&rlz=1C1CHBF_enUS716US717&oq=dof+apps&aqs=chrome..69i57j0l5.2479j0j4&sourceid=chrome&ie=UTF-8
Aug 24, 2017 07:47:37 #
billnikon
Loc: Pennsylvania/Ohio/Florida/Maui/Oregon/Vermont
John Martin wrote:
If I am shooting with a D7100 and my lens is a 105mm my F stop is 20 and my subject is about 4 to 5 feet away, how wide is my DOF. Thank you- still new to this.
If your shooting a person, use single focus spot, (use the center one), put that spot on the persons eye, lock focus, recompose, and shoot. If the eyes are in focus, you subject should look fine, even at F4.
Aug 24, 2017 08:30:31 #
If you are interested in macro, stop by the "True Macro" forum here on UHH
Aug 24, 2017 08:55:01 #
Go to the internet and you can find several very good websites that let you calculate DOF. It changes every time you use your camera to take a picture. Read and understand more about DOF.
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