The ISO override is a separate process, as it adds exposure uniformly and doesn't just correct vignetting. Shooting two pics with and without vignetting comp shows the correction is clearly targeted at the vignette and doesn't touch the center exposure.
Yes, that's why I reminded any possible reader about the crops size and position.
But why does it say Auto in EXIF when set to OFF in the camera? (And why does it say ISO100 in EXIF when we clearly have an increased gain at the larger apertures? And what idiot decided vignetting correction should be done in the raw file? And...)
Yes, this is infuriating to say the least. These are baked in the raw files, people have discussed this exact issue on these forums. I'm realizing the initial test done in that threadalso shows the increase in global brightness even before enabling vignette comp: https://photos.smugmug.com/photos/i-9c2v79D/0/fe263c8b/XL/i-9c2v79D-XL.gif
Re: Sony silently applying gain at certain apertures
Jonas B wrote: ImDaJim wrote:
The ISO override is a separate process, as it adds exposure uniformly and doesn't just correct vignetting. Shooting two pics with and without vignetting comp shows the correction is clearly targeted at the vignette and doesn't touch the center exposure.
Yes, that's why I reminded any possible reader about the crops size and position.
But why does it say Auto in EXIF when set to OFF in the camera? (And why does it say ISO100 in EXIF when we clearly have an increased gain at the larger apertures? And what idiot decided vignetting correction should be done in the raw file? And...)
Yes, this is infuriating to say the least. These are baked in the raw files, people have discussed this exact issue on these forums. I'm realizing the initial test also shows the increase in global brightness even before enabling vignette comp: https://photos.smugmug.com/photos/i-9c2v79D/0/fe263c8b/XL/i-9c2v79D-XL.gif
Feb 16, 2026 at 10:13 AM
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