17 and 24mm TS-E lens profile?

Steve BB wrote:

Does anyone have any settings for Vignette amount and midpoint that they use when non-shifted?

Surely there can be a standard profile or universal settings to use when not shifted, as it's a known value?

https://www.opticallimits.com/canon_eos_ff/485-canontse17f4ff

VignettingThe Canon lens has an immense image circle so it's no surprise that its vignetting figures are about as good as it gets today. Technically the vignetting is naturally still fairly pronounced at f/4 (@ ~1.3EV) but this is very acceptable for an ultra-wide lens - the Canon EF 16-35mm f/2.8 is worse @ f/4 for instance.

DistortionUltra-wide lenses tend to be a bit "laissez-faire" when it comes to distortion but the Canon TS-E 17mm f/4 L plays in a different league here. It shows only slight barrel barrel distortion of just over 1.1% albeit based on a somewhat wavy subfrequency. This is highly impressive for a lens in this class.

https://www.opticallimits.com/canon_eos_ff/603-canon24f35tse2?start=2

VignettingTS-E lenses are sort of over-designed in their neutral setup because the image circle is substantially bigger than the effective image field. Compared to conventional lenses, the TS-E 24mm f/3.5 L II produces only very slight vignetting on a full format DSLR. In absolute terms you will still be able to spot some vignetting at max. aperture (~1EV). The issue is not really field-relevant anymore from f/5.6 onwards.

Just to illustrate the "sweet spot" effect at this setting - here's qualitative illustration of the effective image field vs the image circle:

MTF (resolution)The Canon delivers very impressive resolution figures at its conventional setup. The image center is already exceedingly sharp at f/3.5 and basically hitting and probably exceeding the limits of the camera sensor. The image center is so-called "diffraction limited" because the maximum performance is already present at max. aperture. The borders and corners are also very sharp here already. There's only a marginal increase in technical quality when stopping down to f/5.6. At f/11 and of course more so at f/16, we're seeing some more diffraction effects which lower the image quality but the lens remains perfectly usable.

Please note that the MTF results are not directly comparable across the different systems!

Below is a simplified summary of the formal findings. The chart shows line widths per picture height (LW/PH) which can be taken as a measure for sharpness. If you want to know more about the MTF50 figures you may check out the corresponding Imatest Explanations

Chromatic Aberrations (CAs)Canon has done an excellent job regarding the reduction of lateral CAs (color shadows at hard contrast transitions). They vary around 0.4px at the image borders which is hardly visible and not relevant anymore.