So I'm an hobbiest photographer, started since I was 8 and have been going on and off about it, since a few years ago I started doing some event all well so far, then I was invited to take a group photo in a small celebration for a price and I setup my tripod...flash, cause it's dark outside next to no light and I have a d810 who's ISO performance isn't the best at 8000...so I get a few informal pics then one person start telling me I shouldn't use the flash that it's too harsh blablabla, setup of the flash was just bouncing on the celling to light up the room..., so now the only formal pictures I have is 'unusable' still I put it in b&w so that the noise is less noticable and called It a day...but still...
Ok rant over sorry...
Oh yeah also edit :
No it was not someone I could tell off in this situation for professional reasons...
Cosmic rays ?