gdanmitchell wrote: alundeb wrote: gdanmitchell wrote:
Something is very wrong if you are getting that "vignetting" with the lens. It looks like something (filter? step down ring? hood mounted incorrectly?) is interfering at the edges and corners.
That cannot possibly be right.
My guess is that the hard vignetting is corrected by the distortion correction. This behaviour is very common among compact cameras. If you look at an uncorrected raw file from say a Canon G7X in an independent raw converter, you will see the same, but much more pronounced.The uncorrected field of view at the wide end is also wider than the focal length suggests.
In-camera correction of vignetting, etc. is common, as is the application of profile corrections in post. However...
... I've never seen a camera/lens do that to the corners where things are working correctly. The furthest corners are nearly black, and the cutoff of light is very abrupt, more so that what you'd see with typical lens vignetting. Seriously, it looks like something is blocking the image corners or a lens with insufficient coverage is being used on a camera with a format that the lens wasn't designed for. Are you sure that you didn't have a filter (UV?) or something on that lens?
Profile corrections can improve things like vignetting, but they cannot turn black corners into a good picture. At a minimum there would be significant DR issues there and color shifts would also be quite likely.
If the lens really does that when set up correctly... I think something is very wrong here.
It was very surprising to me as well the first time I saw how lens correction is taken to a new level.
Here you have an image from the G7X at the wide end, 9 mm. The camera was set to store both jpg and raw images. First the whole image jpg straight out of camera, no crop.
Then what it looks like when I open the raw file in CaptureOne.
The dark corners are not so readily visible here, but you can see how much is cropped from the sensor in the image we normally see as the whole image at 24 mm equivalent field of view.
gdanmitchell wrote: alundeb wrote: gdanmitchell wrote:
Something is very wrong if you are getting that "vignetting" with the lens. It looks like something (filter? step down ring? hood mounted incorrectly?) is interfering at the edges and corners.
That cannot possibly be right.
My guess is that the hard vignetting is corrected by the distortion correction. This behaviour is very common among compact cameras. If you look at an uncorrected raw file from say a Canon G7X in an independent raw converter, you will see the same, but much more pronounced.The uncorrected field of view at the wide end is also wider than the focal length suggests.
In-camera correction of vignetting, etc. is common, as is the application of profile corrections in post. However...
... I've never seen a camera/lens do that to the corners where things are working correctly. The furthest corners are nearly black, and the cutoff of light is very abrupt, more so that what you'd see with typical lens vignetting. Seriously, it looks like something is blocking the image corners or a lens with insufficient coverage is being used on a camera with a format that the lens wasn't designed for. Are you sure that you didn't have a filter (UV?) or something on that lens?
Profile corrections can improve things like vignetting, but they cannot turn black corners into a good picture. At a minimum there would be significant DR issues there and color shifts would also be quite likely.
If the lens really does that when set up correctly... I think something is very wrong here.
It was very surprising to me as well the first time I saw how lens correction is taken to a new level.
Here you have an image from the G7X at the wide end, 9 mm. The camera was set to store both jpg and raw images. First the whole image jpg straight out of camera, no crop.
Then what it looks like when I open the raw file in CaptureOne.
The dark corners are not so readily visible here, but you can see how much is cropped from the sensor in the image we normally see as the whole image at 24 mm equivalent field of view.
gdanmitchell wrote: alundeb wrote: gdanmitchell wrote:
Something is very wrong if you are getting that "vignetting" with the lens. It looks like something (filter? step down ring? hood mounted incorrectly?) is interfering at the edges and corners.
That cannot possibly be right.
My guess is that the hard vignetting is corrected by the distortion correction. This behaviour is very common among compact cameras. If you look at an uncorrected raw file from say a Canon G7X in an independent raw converter, you will see the same, but much more pronounced.The uncorrected field of view at the wide end is also wider than the focal length suggests.
In-camera correction of vignetting, etc. is common, as is the application of profile corrections in post. However...
... I've never seen a camera/lens do that to the corners where things are working correctly. The furthest corners are nearly black, and the cutoff of light is very abrupt, more so that what you'd see with typical lens vignetting. Seriously, it looks like something is blocking the image corners or a lens with insufficient coverage is being used on a camera with a format that the lens wasn't designed for. Are you sure that you didn't have a filter (UV?) or something on that lens?
Profile corrections can improve things like vignetting, but they cannot turn black corners into a good picture. At a minimum there would be significant DR issues there and color shifts would also be quite likely.
If the lens really does that when set up correctly... I think something is very wrong here.
It was very surprising to me as well the first time I saw how lens correction is taken to a new level.
Here you have an image from the G7X at the wide end, 9 mm. The camera was set to store both jpg and raw images. First the whole image jpg straight out of camera, no crop.
Then what it looks like when I open the raw file in CaptureOne.
The dark corners are not so readily visible here, but you can see how much is cropped from the sensor in the image we normally see as the whole image at 24 mm equivalent field of view.
gdanmitchell wrote: alundeb wrote: gdanmitchell wrote:
Something is very wrong if you are getting that "vignetting" with the lens. It looks like something (filter? step down ring? hood mounted incorrectly?) is interfering at the edges and corners.
That cannot possibly be right.
My guess is that the hard vignetting is corrected by the distortion correction. This behaviour is very common among compact cameras. If you look at an uncorrected raw file from say a Canon G7X in an independent raw converter, you will see the same, but much more pronounced.The uncorrected field of view at the wide end is also wider than the focal length suggests.
In-camera correction of vignetting, etc. is common, as is the application of profile corrections in post. However...
... I've never seen a camera/lens do that to the corners where things are working correctly. The furthest corners are nearly black, and the cutoff of light is very abrupt, more so that what you'd see with typical lens vignetting. Seriously, it looks like something is blocking the image corners or a lens with insufficient coverage is being used on a camera with a format that the lens wasn't designed for. Are you sure that you didn't have a filter (UV?) or something on that lens?
Profile corrections can improve things like vignetting, but they cannot turn black corners into a good picture. At a minimum there would be significant DR issues there and color shifts would also be quite likely.
If the lens really does that when set up correctly... I think something is very wrong here.
It was very surprising to me as well the first time I saw how lens correction is taken to a new level.
Here you have an image from the G7X at the wide end, 9 mm. The camera was set to store both jpg and raw images. First the whole image jpg straight out of camera, no crop.
Then what it looks like when I open the raw file in CaptureOne.
The dark corners are not so readily visible here, but you can see how much is cropped from the sensor in the image we normally see as the whole image at 24 mm equivalent field of view.
gdanmitchell wrote: alundeb wrote: gdanmitchell wrote:
Something is very wrong if you are getting that "vignetting" with the lens. It looks like something (filter? step down ring? hood mounted incorrectly?) is interfering at the edges and corners.
That cannot possibly be right.
My guess is that the hard vignetting is corrected by the distortion correction. This behaviour is very common among compact cameras. If you look at an uncorrected raw file from say a Canon G7X in an independent raw converter, you will see the same, but much more pronounced.The uncorrected field of view at the wide end is also wider than the focal length suggests.
In-camera correction of vignetting, etc. is common, as is the application of profile corrections in post. However...
... I've never seen a camera/lens do that to the corners where things are working correctly. The furthest corners are nearly black, and the cutoff of light is very abrupt, more so that what you'd see with typical lens vignetting. Seriously, it looks like something is blocking the image corners or a lens with insufficient coverage is being used on a camera with a format that the lens wasn't designed for. Are you sure that you didn't have a filter (UV?) or something on that lens?
Profile corrections can improve things like vignetting, but they cannot turn black corners into a good picture. At a minimum there would be significant DR issues there and color shifts would also be quite likely.
If the lens really does that when set up correctly... I think something is very wrong here.
It was very surprising to me as well the first time I saw how lens correction is taken to a new level.
Here you have an image from the G7X at the wide end, 9 mm. The camera was set to store both jpg and raw images. First the whole image jpg straight out of camera, no crop.
Then what it looks like when I open the raw file in CaptureOne.
The dark corners are not so readily visible here, but you can see how much is cropped from the sensor in the image we normally see as the whole image at 24 mm equivalent field of view.
Sep 06, 2019 at 11:25 AM
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