Lens design: why all RF zoom lens don't have a LOCK button?

[stillviking]

Hello people,

I own a Canon RF 70-200 f4 L that has a button that locks zoom at 70mm. I just love this feature. Bought a RF 15-35 2.8 L and the same doesn't happen, it's always rotating the zoom and moving.

Why Canon just don't do this by rule? It's an fantastic feature to have!

Cheers!

 

[YuengLinger]

Funny, I've wondered about the 15-35mm myself, though on mine there has never been even a tiny amount of "zoom creep." It's always been very tight. Still, it would certainly be a good option as time goes by, because I'll admit I have not used that lens as much as others over the several years I've had it.

Maybe version II will have it? If there is a version II.