Tag Archives: sharpness

Composition – Creating many photographs with different crops of an original

Composition – Creating many photographs with different crops of an original

Some of your photographs have the potential to look interesting with many different crops. Of course cropping reduces the resolution of your image, makes the noise more visible and reduce sharpness so you have to judge for yourself how much your are willing to crop.

For this article, I made an experiment with a photograph that I took of the singer songwriter Doctor Robert. There you can see how many variations are possible from a single image, and I invite you to experiment the same with your images.

http://www.damienfournier.co. Example of creating many photographs with different crops of an original

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damienfournierco

February 7, 2014

Flash Technique – The 1st and 2nd curtain explained

A DSLR camera provides the option to fire the flash on the 1st or 2nd/rear curtain, which can produces different photographs in the same conditions.  This article explains what it means, and how to use it.

The series of pictures below shows a tennis ball falling down, captured with different settings of flash and ambient light. It put in evidence the influence of setting the flash on the 1st or 2nd curtain.

flash_technic_curtain_drawing_2The rest of the article also explains what are 1st and 2nd curtains, and provides recommendation on which setting is better.

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damienfournierco

February 1, 2014

Depth of Field and Hyperfocal Distance

The Depth of Field (DoF) increases with the distance to the subject, and even becomes infinite beyond a certain distance, which is called the hyperfocal distance. This article tells you everything you need to know about it…

dof_near_and_far_limits

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damienfournierco

January 25, 2014

Depth of Fied and Circle of Confusion

The definition of Depth of Field (DoF) from Wikipedia says that it is “the distance between the nearest and farthest objects in a scene that appear acceptably sharp in an image“. It relies on the notion of “acceptable sharpness” which is based on a criteria called the ”Circle of Confusion” (CoC). This article explains the essential about the criteria of sharpness and DoF.

A photograph is exactly sharp only on the focus plane, and more or less blur around it. The transition between little blur and definitely blur is gradual, so where do we determine the limit of acceptable sharpness that defines the Depth of Field (DoF)?

dof_coc_gradual_blur2

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damienfournierco

January 10, 2014

Introduction to Depth of Field

This article is the first of a series dedicated to the concept of Depth of Field (DoF). It is a technically complex topic that scares many photographers including the experienced ones, and caries many popular misconceptions. The aim of these articles is to explain ‘how to control the DoF in your photographs’ in an understandable, but accurate way.

The articles will explain among other things that :
– DoF is not 1/3 in the front and 2/3 behind the focus point.
– Aperture is not the dominant parameter to control DoF.
– It is possible to make a group shot of 120 people with an aperture of f1.2 and have everyone in focus.
– A blurred background is not the same thing as a shallow DoF.
– It is possible to estimate the DoF at a glance in just a couple of seconds.

dof_limits_guitar_crop

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