(You just have to read a thread starting with that subject, don't you?)
On a matter of safety, rules say "Keep your finger off the trigger"
yet I see many people doing this:
Placing an ink pen, marker, wood dowel, or shotgun shell into the trigger guard and resting a gun on the item to take a photo of the gun. Isn't this just as dangerous as a finger on the trigger? Maybe more so, your finger has nerves telling you your pressing it, and that the trigger is moving, the dowel has no feed back, less control.
Suppose you trip while reaching for the gun after taking the picture, you end up catching your fall by pushing down on the gun. If its loaded it's going off. (And all guns are loaded, aren't they?)
I suggest that there is really no reason to be placing an item of any kind into a trigger guard. Take the picture with the gun laying flat on the table.