Ranchy, you tried shifting and you kept the hood on? I didn't see those blackened areas in your images except when I was using with Filters at shift plus minus 24.
Anyways, my 2 tile Vertorama, but 15mm FOV seems to be intact.
https://flic.kr/p/P4DYFo
Another one is a 3 tile Vertorama ...
https://flic.kr/p/NG5LZU
Some basic observations -
- Great resolution from the lens, and I dare say it rivals the 15-30 at the edges. Probably better it.
- Firefly's plastics does make it difficult to mount the 95mm filters. The same thing for me when I was using the Sigma 10-20 in the past.
- Great weight versus say the 15-30mm. Firefly hor. Not Blackstone.
- Infinity click on the focusing while quite gimmicky is actually quite a plus in my opinion.
- Better for me to pano than say the 15-30 because pano gear adds weight and this lens help save some overall weight.
- Quite tight focus ring. Not a bad thing ...
- The provided hood has a definitive way of being attached and detached. Don't press on the smaller petal of the hood, press on the bigger petal.
- Complete lack of distortion which is really really useful. It's a pain with some lenses, and cannot be even corrected by PS or LR.