I tend to agree with you Alisa that for the most part we are consticted in our viewing field because of our limited sight.Light travels in a straight line at approx 186,300 miles a second, that is our boundary.

Ufo's are probably travelling above that speed, which is then out of our range, so they may be there but we will not see them.
The same goes for spirit which vibrates at a much higher level than the majority of us can deal we, hence, we cannot see it, so for the majority it does not exist.

Regarding the flash , I find that makes no difference, as I do not use it. My photos were taken without it. The same for spirit photos.

I have another photo to show. This is taken from a general sky shot. I have zoomed in on what appears to be a cloud, but it's shape made me suspicious.




Here is another magnified photo of the same object, which i have enhanced with a bit of colour to get a better look at it.
It looks like a kind of craft to me with occupants on board.