In this orientation, both knobs are quite usable on the 50D. Like no tilt-shift lens before them, the TS-E 24m L II and TS-E 17 L's tilt feature rotates independently of and in relation to the shift movement. This is a really nice feature - its called TS rotation. In the past...
Adjustment knobsAll metal.Rear BarrelMetal.Identity 14 karat gold-filled debossed metal plate behind focus ring, also white paint on bottom of barrel.Internals Seem like all metal!Moisture Seal at MountYes.MountDull chromed metal.MarkingsPaint....
The L lens has the additional rotation feature, enabling the tilt and shift axis orientation to be immediately changed and it has larger knobs along with a zero-tilt-lock with release button. The L lens picks up an additional aperture blade, with a count of 9 vs. 8, with 18-point ...
The various tilt, shift and rotation knobs and levers do not make this the most comfortable lens to handhold, but it is not bad in that regard. The camera this lens is mounted to will most often find itself tripod-mounted and in that case, handholding comfort is a non-issue. ...