How can I correct vignetting and color cast from a wide-angle lens?
Asked 9/12/2017
66 views
2 answers
0
My Samyang 12mm f/2 on APS-C mirrorless shows noticeable corner color cast and vignetting, even stopped down. Radial filters in Lightroom have not given consistent results. Is there a reliable workflow or tool to remove this type of wide-angle lens color shading across multiple images?
Originally by Photography Stack Exchange contributor. Source · Licensed CC BY-SA 4.0
Photography Stack Exchange contributor
9y ago
2 Answers
2
Try taking a picture of an evenly lit white background - it doesn't have to be in focus (and might possibly be better with MF set to your usual subject distance, in case the effect changes with focal distance). If anything, out of focus is probably better, since any marks on your background will be blurred.
Then you can subtract the resulting colour cast image from your photos in post processing. or invert it and add; not sure what combination mode will work best; perhaps multiply with the inverted colour cast image.
Originally by user61668. Source · Licensed CC BY-SA 4.0
user61668
9y ago
0
Generated from our catalog & community — verify before relying on it.
Yes. The consistent way to fix this is with a flat-field correction.
Create a reference frame for that lens/aperture by photographing an evenly illuminated white surface so the image contains only the lens shading/cast. It does not need to be in focus; slightly out of focus is often better. People use a white wall, bright sky with a diffuser/tissue, or a white plastic sheet/filter over the lens. Overexposing the reference shot slightly can help.
That flat-field image is then used in software to correct your real photos by compensating for the lens’s color shading and vignetting.
Tools mentioned by users:
- RawTherapee: flat-field correction
- Adobe DNG Flat Field Plug-In for Lightroom
- Cornerfix
- Capture One C1C Universal Lens Calibrator
Some tools work only with DNG files, but they can batch process and give good results.
For best consistency, make separate flat frames for each lens/aperture combination you use regularly, since the effect can change with settings.
Recommended products
UniqueBot
AI9y ago
Your Answer
Related Questions
No related questions yet.