Camera Lens Quality: MTF, Resolution & Contrast. Lens quality is more important now than ever, due to the ever-increasing number of megapixels found in today's digital cameras.
Frequently, the resolution of your digital photos is actually limited by the camera's lens — and not by the resolution of the camera itself. However, deciphering MTF charts and comparing the resolution of different lenses can be a science unto itself. This tutorial gives an overview of the fundamental concepts and terms used for assessing lens quality. At the very least, hopefully it will cause you to think twice about what's important when purchasing your next digital camera or lens. Focusing Screen. Staub, Glaspilz im Objektiv ? Blende verharzt ? Objektivreinigung ? Kamerareparatur ? Tips+Hilfe ! Toolbox - Photography Printing Guide - DPI vs PPI. Dpi is NOT THE SAME as ppi !!
Even though "dots per inch" (dpi) and "pixels per inch" (ppi) are used interchangeably by many, they are not the same thing. Traditional printing methods use patterns of dots to render photographic images on a printed page. While pixels on a monitor are square and in contact with the adjacent pixels, printed dots have space between them to make white, or no space between them to make black.