08-31-2016, 10:18 AM
When I had the 18-35/1.8, I also put it just for fun in front of the D800 without activated DX-format switch. I remember there was plenty of distance to the visibly darker image-circle areas. But I didn't test or shoot pictures at that situation, not to mention measuring the vignetting. I guess there is some more vignetting wide open at 18-20 mm - but which other wide angle has no? I could still send the 20/1.4 Art FF in to be on the very safe (and big and heavy and chunky) side of things. I just guess (again) after stopping down 2 or three stops, it will become hard to see vignetting.
With the panorama were two apps involved: Iridient, becasue it's much faster and allows more control including cropping than Sigma PhotoPro. And Affinity Photo. I recall to have been at the end of the panorama in the "develop persona" (meaning, the raw-developing module of the app) to lift up the shadows. I cannot first could not, but now I do see what you wrote about, but that doesn' mean much as there is no wide gammut monitor involved on my side. You're right. I suspect, the shadows were underexposed already and careless denoising did the rest. I just don't feel much at home with Irdient's or Affinty Photo's noise treatment. Maybe the lifting up of the shadows in Affinity brought in the effect. It was clean when I looked at it before Iridient's batch processing. Ok, "clean enough" for me who doesn't bother much about noise anyway. And honestly, since Sigma's PP 6.3 is supersloooooow in displaying the results, I just leave the noise part on standard settings.
Btw. the magenta tint could also Be caused by the light temperature, the sky was very much evening magenta and there are walls reflecting that to the side of the building. When I look at the upper left side, I also see CA which I didn't correct before.
But noise at 100 ISO (to answer this part of your question as well) can be improved. It was the sharpness which keeps impressing me. From a comparatively cheap (yet old) camera.
With the panorama were two apps involved: Iridient, becasue it's much faster and allows more control including cropping than Sigma PhotoPro. And Affinity Photo. I recall to have been at the end of the panorama in the "develop persona" (meaning, the raw-developing module of the app) to lift up the shadows. I cannot first could not, but now I do see what you wrote about, but that doesn' mean much as there is no wide gammut monitor involved on my side. You're right. I suspect, the shadows were underexposed already and careless denoising did the rest. I just don't feel much at home with Irdient's or Affinty Photo's noise treatment. Maybe the lifting up of the shadows in Affinity brought in the effect. It was clean when I looked at it before Iridient's batch processing. Ok, "clean enough" for me who doesn't bother much about noise anyway. And honestly, since Sigma's PP 6.3 is supersloooooow in displaying the results, I just leave the noise part on standard settings.
Btw. the magenta tint could also Be caused by the light temperature, the sky was very much evening magenta and there are walls reflecting that to the side of the building. When I look at the upper left side, I also see CA which I didn't correct before.
But noise at 100 ISO (to answer this part of your question as well) can be improved. It was the sharpness which keeps impressing me. From a comparatively cheap (yet old) camera.