Lens are used to earn you focus for the focus system, you will get the one corresponding to what you picked out after completing the Second Dream quest. It seems that all trees can be access but their is a barrier (50,000) focus before you can get access to any of the good stuff inside. The tree you picked out will have this barrier already completed. Lens can be installed in any of the following MAX RANK WARFRAME, PRIMARY, SECONDARY, MELEE WEAPONS ALONG WITH ALL ARCHWING ITEMS. Once installed DIRECT KILL AFFINITY GATHERED TOWARDS THAT ITEM IS TRANSFERRED AS FOCUS. If you forma an item with a lens you will not gain focus from that item until it hits 30 again. you can have multiple different lens on one load-out but only one lens per item. Once focus is gathered go back to you Focus menu (back of the ship talk to kid you) select the tree which has focus gather select a skill and click on focus to donate focus towards it. In game you will find a circle with the focus icon next to your energy bar when filled press 5(pc) to use your new focus ability.
STEPS TO INSTALL A LENS
1. GO TO THE UPGRADE SCREEN OF YOUR CHOSEN ITEM
2. CLICK ON ACTIONS (bottom left corner of screen)
3. ON THE FARTHEST RIGHT THERE SHOULD BE A BUTTON LABELED FOCUS LENS CLICK IT
4. SELECT THE LENS YOU WISH TO INSTALL
5. DONE, GO FORTH AND GATHER FOCUS NOW.
LENS CAN BE REPLACED BUT NOT REMOVED. REPLACING A LENS WILL DESTROY IT
SINCE THERE ARE A PART OF THE NEW SORTIE DROP TABLE I DOUBT THEY WILL DROP ALL THAT OFTEN
–THE LENS YOU PUT IN YOUR LOAD OUT DOES NOT EFFECT WHICH FOCUS POWER YOU USE-
Once you unlock more than one focus tree you can select which one is the “primary” (if you only have one unlock that is your primary) this will be the focus power you use in game. Lens are only used to gather focus which is used to unlock other trees or nodes which correspond to the focus you gather.
-I AM MISSING THE SECOND DREAM QUEST OR THE FOCUS LENS BUTTON-
You have to complete the second dream quest to start working on lens and focus, and you can only start second dream once you beat natah.
Natah quest info^