ketang wrote: khurram1 wrote:
Thanks for the answer on the firmware (going to Jasper NP, and don’t want to risk issues with new firmware yet), as well as further examples I think fir this shot (at least viewing on phone l), vignetting works l, and I think I like the processing on the last one the best )more pop and contrast).
When you say you processed using ACR, is that within LR?
ketang wrote: khurram1 wrote:
Question for Jesse, Stan and Ketang, from your impression using the lens, how effective do you think the vignetting and in-camera/software corrections would be for handling snow/ice foregrounds like the ones in the sample pictures I posted. Would detail in the corners be lost Would the snow in the corners still be darker/grayer?
Decisions, decisions!!! I hope you guys keep posting more examples and if you can, it would be great to get some apples to apples comparison of what sunstars look like!
I think the corrections will be sufficient. Here are three 14mm images below that might help. Each is 14mm f/4 (worst vignetting) from the same raw file but processed differently.
(1) In-camera R5 conversion, mandatory distortion correction, peripheral illumination correction off
(2) Same as above but peripheral illumination correction on
(3) ACR conversion with hard vignetting mostly cropped, some left in, exposure adjustments but not specific vignetting correction and no lens profile available
As you can see, the ACR image is wider even after a bit of cropping. I like having the optional to crop a bit with some vignetting (I often add some vignette to most of my images) and get an image wider than 14mm. For the in-camera versions, the distortion profile crops out all the hard vignetting and perhaps applies some peripheral illumination correction. When you affirmatively turn "on" the peripheral illumination correction it removes the "normal" vignetting you'd see with any other lens. I think that the future ACR profile will be able to do the same and you won't have issues with even snowscapes because after the corrections the hard vignetting is gone and its still wider than my 15mm prime.
To answer your later question, I didn't do a firmware update specifically for the 14-35, perhaps they accounted for it in the latest firmware or its communicated by the lens alone.
Yes ACR is the same as LR, it’s the name for the raw conversion interface within Photoshop.
Small point of clarification for folks who may not be photoshop users. While raw conversion and other post-processing all take place within one program in Lightroom, Photoshop uses a separate application for raw conversion. Photoshop users typically organize and select photographs in the Bridge program. From there we open them in the Adobe Camera Raw application to do the conversion. (And, yes, it uses the same conversion engine used in Lightroom.) Then we open the converted file in Photoshop.
In Lightroom: Lightroom does everything.
In Photoshop: Bridge -> ACR -> Photoshop
Adobe has done a useful job of integrating these applications so that they can be used someone independently or treated as a cooperating set. For example, when I open my raw files in ACR and "convert" them, I can either export the converted image as a separate file or (as is my preference) open it as a smart layer in Photoshop... which allows me to seamlessly reopen the file in ACR for touch up even as I work on it in Photoshop.
ketang wrote: khurram1 wrote:
Thanks for the answer on the firmware (going to Jasper NP, and don’t want to risk issues with new firmware yet), as well as further examples I think fir this shot (at least viewing on phone l), vignetting works l, and I think I like the processing on the last one the best )more pop and contrast).
When you say you processed using ACR, is that within LR?
ketang wrote: khurram1 wrote:
Question for Jesse, Stan and Ketang, from your impression using the lens, how effective do you think the vignetting and in-camera/software corrections would be for handling snow/ice foregrounds like the ones in the sample pictures I posted. Would detail in the corners be lost Would the snow in the corners still be darker/grayer?
Decisions, decisions!!! I hope you guys keep posting more examples and if you can, it would be great to get some apples to apples comparison of what sunstars look like!
I think the corrections will be sufficient. Here are three 14mm images below that might help. Each is 14mm f/4 (worst vignetting) from the same raw file but processed differently.
(1) In-camera R5 conversion, mandatory distortion correction, peripheral illumination correction off
(2) Same as above but peripheral illumination correction on
(3) ACR conversion with hard vignetting mostly cropped, some left in, exposure adjustments but not specific vignetting correction and no lens profile available
As you can see, the ACR image is wider even after a bit of cropping. I like having the optional to crop a bit with some vignetting (I often add some vignette to most of my images) and get an image wider than 14mm. For the in-camera versions, the distortion profile crops out all the hard vignetting and perhaps applies some peripheral illumination correction. When you affirmatively turn "on" the peripheral illumination correction it removes the "normal" vignetting you'd see with any other lens. I think that the future ACR profile will be able to do the same and you won't have issues with even snowscapes because after the corrections the hard vignetting is gone and its still wider than my 15mm prime.
To answer your later question, I didn't do a firmware update specifically for the 14-35, perhaps they accounted for it in the latest firmware or its communicated by the lens alone.
Yes ACR is the same as LR, it’s the name for the raw conversion interface within Photoshop.
Small point of clarification for folks who may not be photoshop users. While raw conversion and other post-processing all take place within one program in Lightroom, Photoshop uses a separate application for raw conversion. Photoshop users typically organize and select photographs in the Bridge program. From there we open them in the Adobe Camera Raw application to do the conversion. (And, yes, it uses the same conversion engine used in Lightroom.) Then we open the converted file in Photoshop.
In Lightroom: Lightroom
In Photoshop: Bridge -> ACR -> Photoshop
Adobe has done a useful job of integrating these applications so that they can be used someone independently or treated as a cooperating set. For example, when I open my raw files in ACR and "convert" them, I can either export the converted image as a separate file or (as is my preference) open it as a smart layer in Photoshop... which allows me to seamlessly reopen the file in ACR for touch up even as I work on it in Photoshop.
Hope that make sense to the non-Photoshop users.
Dan
Aug 31, 2021 at 09:28 AM
Previous versions of gdanmitchell's message #15695100 « Canon RF 14-35 f/4L IS USM Ongoing Review »
Would the snow in the corners still be darker/grayer?
