The contrast imaging of Canon 1635 2.8 is different from that of Canon 1735 2.8. Why? Urgent! ! ! ! !

This problem is more complicated, and it will be difficult to say clearly for a while.

I believe you must use M-scale, manual white balance, and the two lenses keep the same exposure parameters and illumination.

17-35 is a lens in the film era. Its optical structure and coating technology are not very advanced, and the dark angle is not well corrected. The central part is bright, so it looks very transparent, but in fact the edges are very dark. Because film and CMOS are different imaging media, there will be some differences. In my opinion, it's less than one exposure.

Different lens structures and focal lengths will not lead to different light input. Canon's lens is gray when it is straight out. If you increase the half gear to the first gear, it will be more transparent, and you can also brighten it later.

The above is roughly superficial.