When I left the Canon family and moved over to Nikon in order to go up to full frame (D750) I lamented having to leave behind my 3 favorite lenses (in order of most favored first) - Sigma 50-150 2.8 OS HSM EX, Sigma 18-35 1.8 Art, and my Canon 17-55 2.8 IS. Well since I recently picked up a D7200 as my backup camera (and as a cheap way of extending reach on my Tamron 150-600) I decided I may as well pickup a Sigma 50-150 2.8 OS whenever the opportunity arises since I knew how rare a good used copy was becoming...
So as soon as it arrived this afternoon I took a few quick snaps with the lens mounted on my D750 just to see how bad the vignetting would be and the following pictures are the result. (For those not interested in going further - I was actually shocked at how useful this lens works on a full frame sensor even though it is meant for crop!) All of the pictures below were shot originally in RAW and then minimal processing in Lightroom 5.7 to convert to Jpeg. On the lens corrected jpegs below - note that all I did was put a checkmark in the lens correction portion - I did NOT adjust the effects manually which would likely reduce the vignetting even more on some of these.
***EDIT - After posting I realized that out of sheer habit I had taken all of these photos with the lens hood on! This significantly effects the shape of the vignette!!! - Because of this error I went back and added 4 new photos in POST #8 of this thread with the lens hood removed while in Full Frame mode and in 1.2 Crop mode in camera (Pictures will be forthcoming)
50mm in Full Frame Mode - wide open at 2.8.
This first one had no lens corrections and no CA removed
This below had Lens Correction applied and CA removedIMAGE LINK: https://flic.kr/p/DU4NJZ GM1_8803 Full Frame 50mm by Gabriel Martinez, on Flickr
Although there is hard vignetting it doesn't look too horrible to me anyways.
150mm in Full Frame Mode - wide open at 2.8
No Lens Corrections and no CA removedIMAGE LINK: https://flic.kr/p/E3i7HK GM1_8806 Full Frame 150mm by Gabriel Martinez, on Flickr
The below had Lens Corrections applied and CA removedIMAGE LINK: https://flic.kr/p/D5VhG4 GM1_8806 Full Frame 150mm by Gabriel Martinez, on Flickr
Although there is some hard vignetting there it is manageable and the lens correction did clear some of the edge vignetting.
50mm in 1.2 Crop Mode -wide open at 2.8
No Lens Corrections and no CA removedIMAGE LINK: https://flic.kr/p/DZYe6q GM1_8804 1.2 Crop 50mm by Gabriel Martinez, on Flickr
WOW - this was were I was getting giddy. at 1.2 the vignetting was disappearing even before lens corrections and in the viewfinder!
This below was with Lens Corrections and CA removedIMAGE LINK: https://flic.kr/p/DAcCcN GM1_8804 1.2 Crop 50mm by Gabriel Martinez, on Flickr
I was amazed to see there was minimal vignetting left in the extreme corners!
150mm in 1.2 Crop Mode - wide open at 2.8
This one was with no lens correction and no CA removedIMAGE LINK: https://flic.kr/p/D5z3Mw GM1_8807 1.2 Crop 150mm by Gabriel Martinez, on Flickr
The vignetting barely paints the corners. looks like 1.2 crop mode is a sweet spot for this lens as long as it is being used wide open.
This one had lens correction added and CA removedIMAGE LINK: https://flic.kr/p/DZZdWf GM1_8807 1.2 Crop 150mm by Gabriel Martinez, on Flickr
CLEAN... that is all I have to say on that one ok maybe there is light vignette painting but it is light and manageable.