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Sigma 20mm f/1,4 Art or Nikon 20mm f/1,8G ?

Sigma Art Nikon AFS-ED Nikkor Nikon Df 20mm available light

...and then they were three...


 
If something associates these two (three) lenses is certainly the common focal length that makes the tool of subject interpretation useful to general needs, such as wide views where the lens could be able to include more disparate elements, just to reveal the context
 
Immagine Allegata:  0017  _NDF3553  20.0 mm f-1.4  1-800 sec a f - 4,0  Max Aquila photo (C).JPG Sigma Art
Immagine Allegata:  0018  _NDF3558  20.0 mm f-1.8  1-800 sec a f - 4,0  Max Aquila photo (C).JPG Nikon AFS-ED
Immagine Allegata:  0019  _NDF3563  20.0 mm f-2.8  1-1250 sec a f - 4,0  Max Aquila photo (C).JPG Nikon AFD
 
Moreover, the Sigma Art and Nikon AFD-ED lenses are particularly bright, which immediately makes us think to exploit them in light set...even in a cave
(Santa Rosalia Sanctuary on Mount Pellegrino in Palermo)
 
Sigma Art
Immagine Allegata:  0003  _NDF3343  20.0 mm f-1.4  1-100 sec a f - 1,4  Max Aquila photo (C).JPG
Immagine Allegata:  0006  _NDF3359  20.0 mm f-1.4  1-125 sec a f - 2,0  Max Aquila photo (C).JPG
Immagine Allegata:  0007  _NDF3361  20.0 mm f-1.4  1-640 sec a f - 1,4  Max Aquila photo (C).JPG 2x crop
Nikon AFS-ED
Immagine Allegata:  0004  _NDF3348  20.0 mm f-1.8  1-80 sec a f - 1,8  Max Aquila photo (C).JPG
Immagine Allegata:  0005  _NDF3354  20.0 mm f-1.8  1-160 sec a f - 2,0  Max Aquila photo (C).JPG
Immagine Allegata:  0008  _NDF3363  20.0 mm f-1.8  1-400 sec a f - 1,8  Max Aquila photo (C).JPG 2x crop
 
Of course, since the first shots and from their observation into my Nikon Df monitor, used to exalt the high ISO capability light of these two wides, I realized a deep difference in color and exposure that passes between these three different interpretations of the focal object.
As can be seen also in an almost diffused lightness (also if around inevitable ambient light changes),
Immagine Allegata:  0011  _NDF3405  20.0 mm f-1.4  1-40 sec a f - 8,0  Max Aquila photo (C).JPG Sigma Art
Immagine Allegata:  0010  _NDF3404  20.0 mm f-1.8  1-50 sec a f - 8,0  Max Aquila photo (C).JPG Nikon AFS-ED
Immagine Allegata:  0009  _NDF3403  20.0 mm f-2.8  1-80 sec a f - 8,0  Max Aquila photo (C).JPG Nikon AFD
Sigma tends to overexpose equal condition (or the Nikon AFS-ED to underexpose) all across the range of apertures and this leads to get the files differently processed in post-production, as well as to get a different contrast on the subject.
The old AFD plays and exhibits in a different way, since the white balance, as we will see even further.
 
Again,
as I had already noticed when testing the Nikon AFS-ED, also the Sigma Art seems to give something in terms of effective angle of field, both at short distances (about 50cm),
Immagine Allegata:  0083  _NDF4417  20.0 mm f-2.8  1-80 sec a f - 5,6  Max Aquila photo (C).JPG Nikon AFD
Immagine Allegata:  0084  _NDF4418  20.0 mm f-1.4  1-100 sec a f - 5,6  Max Aquila photo (C).JPG Sigma Art
 
than (though less visible) to the further
Immagine Allegata:  0085  _NDF4421  20.0 mm f-2.8  1-200 sec a f - 8,0  Max Aquila photo (C).JPG Nikon AFD
Immagine Allegata:  0086  _NDF4423  20.0 mm f-1.4  1-125 sec a f - 8,0  Max Aquila photo (C).JPG Sigma Art
 
In addition to the list of differences, the minimum distance of focus of Sigma ART is set to 27,5cm  instead of 25cm that the old AFD, but most of the 20cm minimum maf of the Nikon AFS-ED, which may be insignificant on a mediotele, but it is not the same about a 20mm lens
Immagine Allegata:  0015  _NDF3522  20.0 mm f-1.4  1-4000 sec a f - 1,4  Max Aquila photo (C).JPG Sigma Art
Immagine Allegata:  0014  _NDF3521  20.0 mm f-1.8  1-4000 sec a f - 1,8  Max Aquila photo (C).JPG Nikon AFS-ED
determining at the respective maximum openings that amazing bokeh effect showed by these two lenses.
 




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