At three different sites, we've seen a consistent read on 4+ stops corner darkening at 16mm f/2.8 with the new 16-35 f/2.8L III:
TDP: https://goo.gl/pO4uJi (Greater than 4 stops vignetting)
"At 16mm wide open at f/2.8, this lens has very strong vignetting with the corners darkened by over 4 stops, impacting the benefit that the f/2.8 aperture provides."
PZ: https://goo.gl/6dwafV (4.6 stops vignetting)
"A major weakness is the high amount of light falloff in the image corners at 16mm @ f/2.8. A vignetting of 4.6 EV (f-stops) is WAY beyond our usual scale for full format lenses. Unless you have to go for f/2.8 or simply like the effect, you should stop down to at least f/5.6 in order to reduce the light falloff to an moderate degree."
LensTip: https://goo.gl/e2sWwR (Greater than 4 stops vignetting)
"It would be difficult to call this situation other than dramatic. Such high vignetting we haven’t seen so far in our tests. At 16 mm and by f/2.8 in the frame corners disappears 75% of light (−4.07 EV)"
YET, the much pilloried-with-how-they-review-lenses DXO dropped this peach on the world recently:
https://goo.gl/dLKYFt
Can't link it exactly, so either go to Measurements --> Vignetting --> Profiles or just look at the graphic below. They are claiming the vignetting on the III effectively being the same as the II at 16mm f/2.8.
And DPR, partner to DXO (I believe) went so far as to confirm this (more manageable) level of vignetting -- from the DPR author of the lens review, responding to a forum question about it:
"The DXO data reports a 2 and 1/3 stop decrease in the corners when shot at 16mm and an aperture of F2.8; that matches what we saw in the field. Check out our real world image comparison widget and see for yourself, but our observations agree with the DXO data."
So... Does anyone have this new lens yet and can tell us where this really landed?
- A
TDP: https://goo.gl/pO4uJi (Greater than 4 stops vignetting)
"At 16mm wide open at f/2.8, this lens has very strong vignetting with the corners darkened by over 4 stops, impacting the benefit that the f/2.8 aperture provides."
PZ: https://goo.gl/6dwafV (4.6 stops vignetting)
"A major weakness is the high amount of light falloff in the image corners at 16mm @ f/2.8. A vignetting of 4.6 EV (f-stops) is WAY beyond our usual scale for full format lenses. Unless you have to go for f/2.8 or simply like the effect, you should stop down to at least f/5.6 in order to reduce the light falloff to an moderate degree."
LensTip: https://goo.gl/e2sWwR (Greater than 4 stops vignetting)
"It would be difficult to call this situation other than dramatic. Such high vignetting we haven’t seen so far in our tests. At 16 mm and by f/2.8 in the frame corners disappears 75% of light (−4.07 EV)"
YET, the much pilloried-with-how-they-review-lenses DXO dropped this peach on the world recently:
https://goo.gl/dLKYFt
Can't link it exactly, so either go to Measurements --> Vignetting --> Profiles or just look at the graphic below. They are claiming the vignetting on the III effectively being the same as the II at 16mm f/2.8.
And DPR, partner to DXO (I believe) went so far as to confirm this (more manageable) level of vignetting -- from the DPR author of the lens review, responding to a forum question about it:
"The DXO data reports a 2 and 1/3 stop decrease in the corners when shot at 16mm and an aperture of F2.8; that matches what we saw in the field. Check out our real world image comparison widget and see for yourself, but our observations agree with the DXO data."
So... Does anyone have this new lens yet and can tell us where this really landed?
- A