Olympus cameras have a custom option called Shading Compensation. This option corrects for lens vignetting. I have always by default left it on…but I figured let me dig a little further.
This feature is under custom menu G. Shading Compensation, On of Off.
When turned on, it corrects for your lens vignetting. This DOES effect the RAW files. Here are two images. The first is with shading compensation on, and the second off.
Both of these files were shot with neutral exposure at ISO 200 with the 17mm F/1.8 lens at F/1.8. I used an Expodisc to have a clean white surface and point into a light for even illumination. These were from the RAW files! Lightroom and other programs do not automatically read this like the other embedded lens correction profiles. This is a user choice that is baked in to the raw file.
I tried adjusting the vignetted shot in Lightroom to see how close I can get to the Olympus version…and I can get very close. The problem is you can’t see it in normal scenes so easily unless you have a blank shot like this. And even then, you would need to have different settings made for each aperture on each lens. Wow…can you say hassle. I have not seen any drawback in the file quality from turning compensation on. In fact, I like the file I get much better. It is a lot cleaner and more corrected. I can apply my own vignette later if I want.
I have tested this with Panasonic lenses too. It seems to work. I haven’t tested all the Panasonic lenses, but I assume any lenses with EXIF data transmitted via electronics within the m43 group may work with this. Again…I have no clue as I don’t have any non Olympus or Panasonic lenses at the moment. I definitely made a difference on my 8-18mm lens. So in my opinion, there is no reason to have this option off if working with Olympus or Panasonic lenses. I would turn it on.
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