40mm F1.4 DG HSM I Art Refurbished
starting at As low as $639 Regular Price $799
- Developed to meet cine lens performance standards
- Consistent optical quality over the entire sensor
- Soft, beautiful bokeh in the out of focus areas
- Dust and splash resistant structure
- Water and oil-repellent front coating
- Distortion of merely 1% or below
- Hyper Sonic Motor (HSM) for silent, fast autofocus
- Super Multi-Layer Coating reduces flare and ghosting
- Exclusive low-dispersion glass
- Rounded 9-blade diaphragm
TIPA 2019 BEST DSLR PRIME LENS SIGMA 40MM F1.4 ART
Geometrical MTF Chart
10 lines per millimeter measure the lens's contrast ability (red lines). Repeating fine parallel lines spaced at 30 lines per millimeter measure the lens's sharpness ability (green lines) when the aperture is wide open.
Diffraction MTF Chart
Diffraction MTF takes diffracted light at every aperture into account which is very close to actual image data. Geometrical MTF does not consider the diffraction quality of light, yet it tends to show higher values than actual image.
The red line illustrates how the lattice pattern will appear in the actual picture when any lens distortion is taken into account.
The image will be seen as expanded (barrel distortion) in negative values or will be seen as a recessed (pincushion distortion) in positive distortion values.
The horizontal axis shows the image height and the vertical axis shows the brightness of the image
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