Gå videre til hovedindholdet

DoF Calc - Day 79


One of the most difficult areas to grasp within photography is the Depth of Field factor (DoF). Depth of Field refers to the range of distance that appears acceptably sharp. Four major factors influence the DoF - the camera model (type), focal length (lens model), aperture and distance to subject.

My subject is a withered flower placed on a table with a brick wall as a back drop. I want the brick wall to be out of focus and the complete flower to be in focus. Normally I would chose a high aperture (small f-value) like f/1.4. The distance from the camera to the flower is 0.5 meter. The distance from the flower to the wall is 3 meters. I'm using my Nikon D300 with a AF 50mm f/1.4 prime lens. If I add those parameters into a DoF calculator the following appears:


My DoF is only 0.005 meter - that is 0.5 cm! So roughly a few millimeters on each side of the focus point would be in focus.

Here is a photo where I used an aperture of f/6.3. From the enhanced section it is clear that only the first part of the "optimal focus area" is in focus.


What happens if I change the aperture to f/11?


The range that will appear sharp changes to 4.2 cm. A huge difference.

I used an aperture of f/10 for the photograph of the small flower at the top of this blog article and maintained acceptable sharpness. 

I use an app for the iPhone called DoF Calc.

You can find an "On line Depth of Field calculator" here.
Etiketter:

Kommentarer

Send en kommentar

Populære opslag fra denne blog

Blue Cloth Ornament - Day 131

While visiting some our good friends Christina & Morten I had the opportunity to demonstrate some photo apps on my iPhone to nice person who still was unaware of all the bliss appearance on social media can bring you. The subject is the table cloth captured and post processed with the iPhone app "Camera+".
Send en kommentar
Læs mere

Two Paths - Day 64

Days are going by - time is flying - we are getting older - the world is moving. Tic Tac Tic Tac. My professional career has come to a halt and it's time to reflect about the possibilities that opens up in such a situation. It's been a month since I stopped at Strålfors and all days (and some nights) has been used to reflect upon this situation. I've chosen to follow the obvious path - find a new job - and all my network is being activated. But another path has slowly emerged - and to no ones surprise - this path evolves around photography. I'm not talking about becoming a photographer, but to become part of the industry. Tomorrow I'll fly to Stockholm to meet some interesting people who successfully has opened a photography museum in Stockholm - Fotografiska.eu - and I'm going to here about their project and journey. The photo that I shot this afternoon in the woods nearby my home symbolise the break from Strålfors and the two new paths that I've ch...
Send en kommentar
Læs mere

Press photographer has to face a lot of moral issues

Every year we hear about press photographers being killed while trying to capture a decisive photo and document the truth. They also have to face a bunch of moral issues while being close to death and people in need of help. In my opinion it is vital to capture a photo that can influence decisions on a large scale. But when faced with the choice of either keep taking pictures or trying to change the course of a situation by personal interaction (and maybe risk your own life), I can only imaging the moral issues a press photographer must deal with in a few decisive seconds.
Send en kommentar
Læs mere