As shown in the image, the Lens Flare does not appear on the screen in the top image. However, it is displayed when the camera is changed to Orthographic as seen below.
How can I make Lens Flare appear with an Orthographic Camera?
Hi 
I just tried and can confirm that it does not work currently on an Orthographic camera. Could you file a bug?
Thank you!
Oliver
no. there are no way.
@oliverschnabel It has been a long time since the original post and reply, but is this still a bug in unity 6? I am currently experiencing the same issue where if I switch my camera from perspective to orthographic, the lens flare disappear.
Then file a bug report. Doesn’t seem like OP did that
Before filing a bug report I would like to know if the issue was already addressed at some point during the past year: maybe I am not setting up something correctly on my end. If that is not the case then I will file the bug report 