I have an Olympus E-P2 and Panasonic 14-45mm lens. Adobe Lightroom 3 and Photoshop CS5 appear to be performing some very heavy-handed distortion correction at the wide-end of the zoom (running the file through a different raw converter yields dramatically different results at the edges). This is without selecting any lens profile or enabling manual correction. How can I disable this?
P.S. Strangely, ACR 6 is not doing any correction of chromatic aberration. Given that the system is set up to try and fix distortion and vignetting automatically, it would make a lot of sense to fix CA too.
The distortion correction is applied automatically based on the available metadata (from the camera + lens system). The resulting shape of the image should closely match the result of shooting JPEGs. It cannot be disabled in CR/LR.
That's a solution. It doesn't however answer my question. Clearly there is some metadata tag that tells ACR what corrections to apply. Using EXIFTool, I can replace all the metadata with that from a shot with a non-correctable lens. Unfortunately, this screws up my cataloguing by replacing other things like focal length, aperture and so on. It would be nice to know the exact tag. Thanks.