Canon EF-S 18-135mm f/3.5-5.6 IS USM vignetting calibration data about lensfun HOT 3 CLOSED

@MC-DeltaT
Attached you will find the profile I created.
Unfortunately, I don't have any normal pictures available for testing. Please test it against your photos and report back to us or provide us with relevant pictures.
The slightly different crop factors shouldn't play a role. Their difference is far too small.
You only took pictures at 5 focal lengths. May be 6-7 focal lengths would have been better (e.g. 18, 22, 29, 35, 50, 85, 135mm). However, you could have saved yourself some pictures at the high aperture numbers. Please read here (section "Taking pictures") how the pictures should be taken.
Canon_EF-S_18-135mm_f__5-5.6_IS_USM.zip

from lensfun.

Thanks for the data. I have attached some test images. By my eye, looks like the vignetting is significantly, but not completely, corrected. I'm happy with it though :)

May be 6-7 focal lengths would have been better

I had read that article, but only saw that it says to do 5 focal lengths. Might it be possible to update the article?

test_images.zip

from lensfun.

Thanks for your answer.
A correction that is a little too weak is definitely better than a correction that is a little too strong. I will copy the values into the db.
Five focal lengths with 5 aperture stops each are sufficient for most zoom lenses, that's correct. For lenses with a wide zoom range, it can sometimes make sense to add a few more focal lengths.

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