Lens shouldn't affect affinity gain on your weapons - they just take a percentage of Warframe affinity gain and convert it into Focus. RJ Excals on Draco get almost no weapon affinity at all, because all your kills are with Warframe abilities.

There is no way to remove a focus lens from a warframe and put it onto a weapon - you need a new lens for your weapon.

Community content is available under CC-BY-SA unless otherwise noted.