SP 70-300mm F/4-5.6 Di VC USD Model A005 Home
MTF / Download Proof Images
How to Read MTF Charts
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.
MTF (Modulation Transfer Function) Charts
Proof Images [Shooted by bata prototype model ]
Proof Images
Focal length: 220mm
AE Mode: A-mode
Aperture: F/8
Shutter Speed: 1/200 sec.
Image Size: 4032x6048 pixel
ISO Speed: 400

Click the image for unprocessed data

File Size: 15.7MB
Proof Images
Focal length: 300mm
AE Mode: Manual
Aperture: F/9
Shutter Speed: 1/320 sec.
Image Size: 27841848 pixel
ISO Speed: 200

Click the image for unprocessed data

File Size: 4.2MB