Friday, November 8, 2013

Understanding and Achieving Image Focus and Sharpness: Part II

Nikon 51 point Autofocus System layout in the Nikon D4 DSLR, photo courtesy of Nikon Corporation
Image sharpness depends on multiple factors including focus.

While it's true an image can't be sharp unless the subject is in focus, the converse is not necessarily true, that an image which is in focus, will necessarily be sharp. Image sharpness is fundamentally controlled by focus, but there are other important factors which enable in-focus images to be sharp.

In Part I we looked at how modern digital cameras autofocus (AF), and what factors influence AF systems' ability to focus quickly and accurately.

In Part II, below, we'll discuss choosing the best focus mode for a particular subject, manual or autofocus, or using them together, as well as single versus continuous focus, all to achieve a solid focus for a variety of situations common to travel photographers.

Nationwide Suspicious Activity Reporting Initiative out of control

Blast Furnace - Birmingham, ALThe Nationwide Suspicious Activity Reporting (SAR) Initiative (NSI) is a collaborative effort led by the US Department of Justice in partnership with the US Department of Homeland Security, and the Federal Bureau of Investigation, as well as state and local law enforcement agencies. The initiative was ostensibly established to create a coordinated national capacity for gathering, documenting, processing, analyzing, and sharing SAR information to help prevent terrorism and other criminal activity.

On the surface, that appears to merely be a national database initiative of what law enforcement agencies have been doing for years, gathering information regarding criminal behavior and activities, but NSI is different, vastly different.