Voigtlander 15mm and Adobe Flat Field DNG

[oslermarine]

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Hi all, I have been using the voitlander 15mm lens on my M240 and created template images for lightroom flat field DNG. However, when I shoot in different environments I get a strong green center cast after flat field correction. Do I need to shoot a template image on a white card everytime I shoot a different environment? I thought you would only need to have one template of a white wall for the flat field DNG. thanks

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[MikeEvangelist]

That's usually an indication that the reference images aren't good. You need to be careful that there is no variation in the lighting on whatever you're shooting for your ref images. (an inexpensive trick is to put a paper coffee filter over the front of your lens)

 

Also, it's a good idea to increase your exposure when shooting ref images so the whites are nearly at the top of the histogram. This will yield a more accurate ref image.

 

I found that the VC 12mm & 15mm lenses have pretty large variations as they are stopped down, so I have reference images for each full f-stop. It's a bit of a hassle, since I then need to match reference images to each shot's exposures when processing, but it gives excellent results.