MTF (Modulation Transfer Function) curves describe to what extent the tested lens can faithfully reproduce contrast of the subject in images it captures.
The closer the 10 lp/mm (line pairs per millimeter) curve (the thick line for low frequency) in an MTF chart to "1" of the vertical axis (the higher up), the higher the contrast reproduction performance of the tested lens will be. The closer the 30 lp/mm curve (the thin line for high frequency) to "1" (the higher up), the higher the resolving power and thus the subjective sharpness of the lens will be.
Lens performance differs depending upon directions. Solid lines show performance in the sagittal (radial) direction while dotted lines indicate performance in the meridional (circumferential) direction.
When sharp lenses capable of delivering uniform optical performance over the entire image field are tested, MTF charts show curves plotted in good balance.
Performance characteristics of photographic lenses cannot be expressed with only MTF charts. There are other factors that are expressed in different methods, such as taste of softness and degrees of compensation of various aberrations. But you can use MTF charts as a scale to measure lens performance.
Click on the photo to display the original image.
The copyrights of all images used in this special page belong to the photographers who captured the images. The right to use those images belongs to the photographers and Tamron. Copying, modifying, distributing, publishing, displaying, posting, or transferring any images used herein by any form or means whatsoever, partially or in whole, without prior consent by the owner of the copyrights and Tamron, is strictly prohibited.
You can view the images used in this special page for your personal use only or to privately confirm the quality of images on your computer screen or by printing on your printer or other printing methods.
*For further details on copyrights related to the Tamron website, visit "Terms of Use".
