Ensuring a flat field for the vignetting calibration may be the most difficult part, but I found the white ceiling with natural daylight in my living room to be very satisfactory. However here is the good bit - if you shoot a series of calibration images for any lens and send them off to Torsten Bronger, then a suitable calibration file will appear in your inbox after a couple of days. Unfortunately the list of supported lenses is rather limited. The list of supported lenses may be found here.
It is not supported by Rawtherapee which however does support Adobe profiles. Lensfun is a library providing facilities for correction of vignetting, distortion and transverse CA that is used by several image processing applications including a Gimp plugin and Darktable. (may also apply to these tools on MAC or Windows) Just a bit of a heads up for anybody that uses Linux and Gimp, Darktable, Digikam etc.
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