I re-read that one last Halloween, and honestly, the summary always leaves out how weirdly grounded the initial setup feels before it all goes sideways. Greg finds this old camera in a spooky abandoned house owned by the creepy Mr. Saur, right? The first photo he takes is of his friend Michael smiling on his new bike. When the film develops, it shows Michael wrecked and hurt. And of course, the accident happens exactly like the photo predicted.
The key part everyone remembers is the photo of Greg's family in their living room, which later shows the house destroyed and them gone. That image haunts him. The camera's curse escalates – a picture of a bully, Dogface, shows him covered in bees, which then swarms him in real life. The climax involves Greg's dad, a reporter, taking a picture of the camera itself to expose it. The developed photo shows the camera shattered, and that's exactly what happens when Greg smashes it to stop the curse. But the very last line reveals another, identical camera sitting on a shelf, implying the horror isn't over. That final twist messed me up as a kid more than anything else.
It's a classic R.L. Stine escalation: a simple, creepy object with rules that get broken, leading to worse and worse consequences. The family photo threat is the real emotional core, I think.