Here's an image I posted last week on the usual thread, which used Fuji GFX100S and Laowa 20mm shift lens (at max shift).
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What you can't see from this image is how bad the flare problem was in this situation. That bright light on the bridge was not playing nicely with the lens at all. As a side-point, this was not the case with my other lenses, made by Pentax, which handled that light much more gracefully. But they aren't 20mm shift lenses, so everything's a compromise!
Anyhow, here's a shot showing the flare... (processed horribly so that it's easier to see)
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And now some images showing what I did about it (sorry about the quality of these - quick 'phone grabs). I set up my secondary tripod with a dark blanket to block the view of the light from the lens when shooting the stars for about 90 mins. I then took shots without that assemblage in the way (there was no troublesome flare on the bridge itself) and then composited the files together.
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Here's a camera shot showing the scene with the set-up blocking enough of the light (processed similarly to demonstrate the absence of flare):
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Worth it in the end!
P.S. I have decided that this fully corrected shot is 'too corrected' - so the version I end up using seriously will not be quite as straight as this one...