Subject when shooting with flash or backlight

Reflection of the flash on objects and small living creatures that are out of focus at the time of photographing.

Any dense (and not so dense) object out of focus of the camera with a flash or other lighting will look like a translucent or opaque spot. It can be insects, branches, dust particles or precipitation, etc. Most often this appears in evening photos and on surveillance cameras. Moreover, the latter are equipped with IR illumination, which the human eye does not see, but the camera "sees". The presence of IR illumination is necessary in order to get a "normal" (clearly distinguishable) image at night in the absence of outdoor lighting. It usually turns on when the light level decreases to a certain level and turns off during the daytime. The illumination is reflected on the spider that has wove a web in front of the camera, the web itself, or flies, both trapped and just circling in front of the camera.

Often such objects are out of focus of the camera, so their silhouettes are blurred and poorly recognizable.

The web has small sticky droplets on it, so in the IR illumination of the camera it looks like closely spaced dots or beads. Sometimes it changes brightness depending on its position relative to the camera. Usually it is located close to the camera, but due to the perspective and brightness changes, even with small fluctuations, it may seem that these dots appear from afar or vice versa - fly away into the distance in a matter of seconds.