I am now discovering issues with the camera settings with this lens. I almost always use ISO 160 or 320 when there is less light available, but such settings are too slow for an F 16 lens (with its ND filter) and the lens's coverage that often leads to under exposure when using aperture priority. Using overexposure is also not working well since this will wash out any details for the highlights. It works best when covering the entire frame with a shaded subject and without any direct sunshine in the frame. This old lens design is corrected for distortion but it is "not ready" for a digital sensor at a very close distance from the rear glass.
I have been trying out different PP settings to arrive at interesting looking final images. The last few posted images were processed with Perfect Portraits 9 after using LR to convert DNG to JPG files. I chose first the setting "160 NC" where almost all purple streaks disappear. I save this file. Then I use the adjusted file again with Tri-X B&W setting in Perfect Portraits 9. It seems to work well for many of the images, but not all. Some will come out with very dark edges. There, I tried using the Instant Film setting. It sometimes works well that way.
Any advice is welcome.
For color images, I need to download and use CornerFix or something similar.