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This rainbow is coming when i shoot picture in low light.Is there anyway to solve this problem?
Hi @Shuvocasanova,
There's some tips on how to take better low light conditions here.
Just wondering though, do you have a cover or screen protector on your device?
Alright. Just make sure there's no dust or anything over the lens too, try Johans tips and let us know if the issue is still happening 
I found that sometimes... this is actually cause by holding the phone in a position where the flash actually bounces off the finger and reflects back into the lens... cause this sometimes happens to me... then I realized that it was my finger.... lol move my finger and it goes away...
@Shuvocasanova This almost sounds like normal finger grease. it's not common as there should be very few circumstances where you touch the lens this way. However given that a good clean is resolving the issue there is little further I can advise.