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CMS-XML How to Read an MTF Chart
Fine repeating line sets are created parallel to a diagonal line running from corner to corner of the 35mm frame, directly through the exact center of the image area. These are called sagittal lines, sometimes designated " S " on Canon's MTF charts. At a 90° angle to these, additional sets of repeating lines are drawn, called Meridional (or "M") line sets.
CMS-XML How Does Traditional SLR AF Work?
We’ll discuss the many advantages that traditional through-the-viewfinder AF systems offer in this series of AF articles. But before we dive in, it may be helpful to have a quick understanding of how AF has typically worked in our SLR cameras since these systems were introduced back in the mid-1980 s .