Many consider "sharpening" to be the remedy for "out of focus" images. It's not. Out of focus pictures will ALWAYS be out of focus. Sharpening only enhances the edge contrast within an image to create the illusion of focus improvement. But the picture is still out of focus.
A complete article on sharpening is located on my sister site, Hub's iDarkroom - Part 13, Sharpening, Less is Better. Please read this article to get the complete "sharpening" picture (excuse the pun).
This brief post covers the basics of the sharpening function found on most of today's DSLRs.
Sharpening selections on a Nikon DSLR menu
Because of the way digital images are captured by the camera's sensor, a small degree of sharpening is required for EVERY DSLR picture. This sharpening can be accomplished in the camera as it is processed and stored on your data card.
One exception is in the case of RAW image files. RAW images are always recorded WITHOUT sharpening. RAW images still require sharpening but this is done either 1) as you open the image in a RAW converter program or 2) within most digital imaging programs like Photoshop.
From my experience, I believe sharpening is more flexible and precise in the computer using image editing software. For this reason, I routinely use LOW or NO sharpening within the camera. I recommend this as a starting point for any new DSLR owner who processes their own images with a program that provides sharpening options.
This discussion, including illustrations showing the impact of sharpening on your pictures, continues in Hub's iDarkroom.
Please let me know if you have questions or comments.
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