xUND3RTAK3RxRKO said:Shouldn't I use the reward lens too when I'm not Ren?
You certainly can, although using it is absolutely not a must. Even without it, you can still easily get enough points for S+ if you stick to the weakest Type-07 film and avoid spamming Shutter Chances.
Personally, I have not used the Rewards lens at all. I save my spirit power for the Absorb lens since enemies hit harder on Nightmare and I have fewer healing items. However, if your health is high, feel free to use the Rewards lens. :)