Lleuallen
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Jim and Phillip: Regarding the LR flat field plug in. I have successfully used it to fix panoramas created with a Fotodiox shift adapter and OM 28mm full frame lens. This combo shows terrible vignetting and color shift uncorrected.
I got the plastic diffusers required for the correction images from CaptureIntegration. Don't remember what they call the item but it is $19.95 plus exorbitant shipping. There are two diffusers: a small one suitable for most small cameras and a larger size for medium format. I checked into getting some white frosted plexi but the cost difference and not being sure that it would do the job correctly led me to the commercial product which is designed for the task.
You must take a correction exposure with the diffuser for each focal length, aperture, and distance used. If a series of photos have all three variables the same only one correction images needs to be taken. When taking the correction image you must increase the exposure by shutter speed by about two stops so that the histogram shows almost white - near the right edge without clipping.
I took the three pano shifted exposures, then shifted the lens back to the starting point, adjusted the shutter, and took the three correction images, one at each shift. The resulting pano came out excellently.
After the images have been taken it is a piece of cake, that is if the plugin is working properly. I initially had problems getting it to work with LR 4.2 but it mysteriously cleared itself up and is working properly now.
Needed for short lenses only - less than 50mm on my m4/3. My 80mm for example shows no traces of this problem.
Larry
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