The really special Canon TS 35/2.8 S.S.C.
The first tilt shift lens for 35mm ever made. It’s a special purpose lens only sold in low quantities, but you can find them quite often on eBay. Playing around with tilt shift is fun from time to time. I liked it much more on crop than on fullframe. On tilt shift lenses I prefer a narrow field of view. Do you use tilt shift lenses? If so, do you prefer wide angle or tele?