"Vignetting" can mean several things. LetÂ´s pinpoint, what we are talking over here in detail:
1) "natural" vignetting which is produced by any lens and usually compensated to some degree by stopping down.
2) vignetting which results from a lens-shade or a filter-ring.
3) "vignetting" which results from blending in a stitcher.
hohoho. 1), 2) ok, but in no way, the blending can generate vignetting ( case 3 ).
ThatÂ´s why i wrote "vignetting" and not vignetting
best to you, Klaus
Of course blending CAN NOT generate vignetting. But it can handle areas with tonal grading in a way it looks like it.
Of course i checked all my lenses after experiencing the mess with my "oper" pano some months ago - we argued about that - in terms of vignetting.
Despite of all lenses basically vignette - even it you canÂ´t see it - there was no relevant (!) vignetting. But there was tonal grading in each picture - and in each picture in different strenghts. That was caused by the very critical light situation: extremely hard sunlight (March) and a hazy sky.
Usually i refuse to shoot then - but i had to shoot this time.
The lens i used was a Nikon 85mm @f11. I used this lens many times over the years - and never had this issue, never had "vignetting".
Again: i know basically there ALWAYS is vignetting with EACH lens. ThatÂ´s optics and depends on the lenses image-circle as well as it can be caused by filers or sunshades.
But usually vignetting is very low and barely visible with good lenses - and my experiences show itÂ´s completely compensated by APG usually. As i feel the compensation of uneven exposed areas in images - thatÂ´s what is it all about - worked better in earlier versions.
Besides: pictures which i shot using the very same lens but stitched with PTGui didnÂ´t show any issues at all which one would call "vignetting".
I have a feel that it has something to do with the hard-linking of non-cp linked images . . maybe blending does a not so good job here.
The issue comes ONLY with sky-images after being hard-linked together.
This is a more worked-over version: http://www.360impressions.de/KBogen3/
The node "Koenigsallee2" i did using PTGui.
"Schadowstrasse" was done with the 85mm, the rest was done using 35mm.
i managed to compensate the uneven sky in Photoshop a bit.