Questions about Sigma 20mm, f/1.4 DG HSM ART Canon EF

That is correct. For the sake of completeness, here is an explanation for others: Due to the smaller sensor, only a section of the lens is effectively used, resulting in an angle of view similar to that of a lens with a focal length of 32mm. This is called the crop factor. Canon calculates this with a factor of 1.6. Corresponding formula for Canon cameras with APS-C and EF lenses (caution, not EF-S): 20mm (full frame) x 1.6 (crop factor) = 32mm (APS-C) Otherwise, a good explanation with example can be found here: https://fotoschule.fotocommunity.de/cropfaktor-formatfaktor-brennweitenverlaengerung/

No, unfortunately not, but you can do it later in Lightroom or Photoshop.

Thanks for the info.

Yes, the warranty card is enclosed.

Yes, of course, the aperture time has to be right...

Hello Robi08 you see that right, this part even comes with the SSC warranty card which gives "lifetime service warranty". https://www.owy.ch/service/garantie.html