Achieving tack sharp images involves doing lots of small things as well as possible. These tiny differences add up to a noticeably sharper photo.
In photography, the term “tack sharp” describes an image which shows the main subject in sharp focus, with clean lines, crisp details, and no blurring. Achieving this level of sharpness is one of the keys to a truly eye-catching picture.
Taking tack sharp photos is all about reducing camera shake to an absolute minimum. There are many different ways you can do this. Some apply to all situations, while others can only be used in certain circumstances, but each one helps reduce the amount of camera shake by a small fraction. The more methods you can use, the sharper your shots will be.
GENERAL TIPS FOR MAXIMUM SHARPNESS
These tips can be applied in all situations, and you should bear them in mind at all times, as they can make a big difference to any photograph.
1. USE THE SHARPEST APERTURE
Camera lenses can only achieve their sharpest photos at one particular aperture. This is typically 2 to 3 stops down from the widest aperture, putting it around f/8 on most lenses.
Your choice of aperture should be based on other considerations first (such achieving an acceptable shutter speed and depth of field), but try to stay close to this optimum aperture wherever possible.