>>3926968The intensity of the swirl depends on the size of the opening. There, its too small, making the corners squeeze too much. Here's what the 150mm on 645, so close to 90mm equiv, looks like with a bigger opening, around 45mm. Had to dip to 1/60 so its blurry too, but you can see the swirl well. The less extreme swirl you get with a bigger than vertical height of sensor/neg.
