This is part of why -zoom on rivens is so nice. Lets you more easily use those zoom mods!
If there's one thing I really like about Rivens it's that they more easily let you fit in sub-optimal but handy QoL attributes into weapons like -recoil and -zoom by allowing for up to four traits. Sort of like how DE said they wanted to revamp things for Damage 3.0 to encourage greater variety in utility mod usage before that whole idea went away.
Can't say I'm a big fan of most of the other stuff around Rivens, though.
Ahh that explains it, I was unscoping as soon as the first explosion went off because I assumed it was just gonna apply to the whole thing.Does that mean you could fire it from the hip and then scope in for the explosion to get the bonus only on the second half?
AFAIK you can totally hip-fire and then scope before a projectile hits to boost its damage. I haven't tested it with the Lenz explosion, but I expect it would work the same way.