The court heard at a previous hearing that Ruben’s stepson raised concerns with his partner during the camp.
A search of his stepfather’s belongings uncovered items including baby oil, Vaseline and syringes, prompting him to notify police.
Devices belonging to Ruben were later analysed by officers and found to contain more than 50 Category A indecent videos of children, the most serious category.
There were also 22 Category B videos and seven Category C videos made between August 2023 and June last year.
None of the images concerned relate to children who were at the summer camp.
The owners and operators of Stathern Lodge are independent from those who use or hire the lodge were “not connected to the incident”, Leicestershire Police have said.
Before Ruben was sent to HMP Leicester, where he will remain until he is sentenced, Spencer said: “I understand why you were upset earlier. I will sentence you on Friday.
“It will be a very tough day in your life and it will be a very long day.”