Amber, ja nie mam tego szkła. Bazuje tylko na opiniach z netu takich jak tu:Zamieszczone przez Amber
http://www.luminous-landscape.com/re...s/28-105.shtml
I taka opinia jak steveprice z fredmiranda
"Vignetting
There is virtually no observable vignetting from the 24-70 mm lens at any focal length with f4 or smaller apertures. The new lens, on the other hand, has quite pronounced vignetting at 24 mm and f4, which is still apparent at f8. (It’s easily correctable in Camera Raw, which is just as well.)
However, there is no vignetting of any significance at any other focal length or aperture. The new lens only offends at the widest angles.
The 24-70 mm lens is again the winner."
"Some people like this lens, some dont. So how does it stack up by type of camera? I did some sums. I counted who likes it, who doesn't and what sort of kit they have i.e. full frame or crop sensor. In Dec 05 (up to 28th: aVOlanche) there are 31 reviews, this is the breakdown:
Full frame (i.e. 5D owners): 4 out of 4 dislike
Crop sensor: 17 likes, 3 dislikes
Kit not indicated: 5 likes, 2 dislikes.(1)
(1) Reading between the lines I suspect those people whot did not indicate their kit are sub-full frame users. The full frame users who dislike it do so largely because of the vignetting.
My vignetting tests by f stop:
24mm@f4 severe vignetting, correctable to moderate
24mm@f5.6 moderate, correctable to slight
24mm@f8 slight, correctable to very slight
24mm@f11 very slight, correctable to imperceptible
24mm@f16 imperceptible, correctable to none
24mm@f22 none visible
(Severe, moderate, slight and very slight all mean visible).
My vignetting tests by focal length:
24mm@f4 severe vignetting, correctable to moderate
28mm@f4 slight, correctable to very slight
35mm@f4 imperceptible, correctable to none
50mm none
70mm none
105mm none
Cropping test
Instead of correcting the vignetting why not just crop it out using Photoshop? Taking the worst instance of vignetting i.e. 24mm@f4, the original image size of 14.6x9.7 inches had to to be cropped to 12.3x7.5 inches. The new size gives about the same angle of view as the 35mm lens setting or, I suspect, a 1.6 crop! Even after correcting as much as possible for vignetting before cropping I still ended up with about the same size picture, 12.4x7.9 inches. Whats the point of having a full frame sensor at twice the cost if you have to restrict your focal length or crop it to a sub-full frame equivalent.
Shooting conditions
I do a lot of architectural photography and my test shots were of an interior with white walls. I used the camera on its default settings i.e. fine quality jpegs etc.
Post production
My citeria when correcting in Photoshop CS2 (v9), using the vignetting sliders under the lens correction filter option, was not to let whites burn out or to introduce other artefacts as a result of correcting e.g. colour distortions. I did not other correction.
Results
At 24mm, on a 5D, vignetting is apparent at all apertures except f22 and only fully correctable under my test conditions at f16.
Conclusion
Lovers of this lens are sub-full frame. If vignetting is a problem for you and you shoot full frame then test this lens under your typical shot situations first. If like me you like shooting architectural interiors, i.e. wide open in low light then get used to vignetting or go sub-full frame. This is a shame because by going sub-full frame many people are missing the joys of wide angle photography. Some preliminary shots showed that spot on exposure is imperative to keeping vegnetting down to these levels.
Addendum
I knocked this out fairly quickly. If you see any flaws in my argument I will be delighted to hear from you. I am looking for reasons to keep the lens and the 5D. "
I jeszcze kilka innych tego typu opinii, więc nie sadzę, aby to była wina jakiegoś egzemplarza, czy jakiejś partii tych szkieł. Sądzę, że ten typ tak ma, a wg mnie szkło za 4000 PLN, zaprojektowane pod pełną klatkę nie powinno tak się zachowywać.
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