An inquest examining a fatal skydiving accident in far north Queensland of three people — including a mother of eight — has been shown GoPro vision that captured the faces of the victims, before a mid-air collision that saw the trio fall to their deaths.

Mother Kerri Pike, 54, and skydiving instructors Peter Dawson, 35, and Toby Turner, 34, died after colliding mid-air while skydiving at Mission Beach, south of Cairns in far north Queensland in October last year.

Ms Pike and Mr Dawson had been in a tandem jump, which had been a birthday gift from her husband.

Coroner Nerida Wilson gave those in the packed courtroom, including many family members of the victims, a chance to leave the court before the video stills were played.

"Some people might find this distressing — these are people in the final moments of their lives," Ms Wilson told the hearing.

The vision shows Ms Pike smiling and making a love-heart gesture with her hands.

It then shows Mr Dawson's face change, his mouth open.

The reflection in Mr Dawson's sunglasses appear to show Mr Turner underneath the pair with his back to the ground and facing up.

Sunglasses show reflection of chute canopy before impact

Police Sergeant Scott Ezard, from the Cairns Forensic Crash Unit, oversaw the police investigation and reviewed the vision.

Sergeant Ezard said Mr Turner was on a "solo sports jump" and was using his own parachute, when he flew towards the pair and shook Ms Pike's hand in mid-air.

He said Mr Turner then dropped beneath them, with his back facing the ground.

Sergeant Ezard told the hearing Mr Turner's parachute accidentally opened and Ms Pike and Mr Dawson collided with him.

All three then fell to their death.

"The GoPro didn't show any direct evidence of the impact, but you can see Mr Dawson's body start to change and his facial expression changed dramatically — his mouth opens widely," Sergeant Ezard said.

"You can see the reflection of Mr Turner's canopy in Mr Dawson's sunglasses immediately before impact."

Sergeant Ezard told the court that Mr Turner's parachute was too small for the "container" — the pack in which the canopy is held.

"Mr Turner's parachute was a 'racer' — about 90 square feet — it was 50 per cent undersize for that container," Sergeant Ezard said.

Mike Tibbetts, a safety and training officer from the Australian Parachute Federation, also reviewed the vision.

Mr Tibbetts told the court Mr Turner was very experienced and highly regarded in the industry.

He could not say definitely whether Mr Turner had packed his own chute or whether it was packed for him.

A pre-inquest hearing earlier this year heard an Australian Parachute Federation report found the main cause of the incident may have been the "premature deployment of instructor Toby Turner's main parachute" while he was "directly underneath" Mr Dawson and Ms Pike.

The inquest is expected to take five days.