John Lennon’s one and, sadly, only full-length post-Beatles concert, a charity event in 1972 at Madison Square Garden, can now be experienced in IMAX.

That alone makes Oscar winner Kevin Macdonald’s latest documentary “One to One: John & Yoko” a must for fans.

But as the Glasgow born filmmaker noted in a Zoom interview, that’s just one highlight of this intimate look back at the couple when they relocated from London to Manhattan in the early ‘70s.

“We had the concert footage rights but then I heard this interview with John where he said he watched TV.  And that TV was his window on the world. I just had this flash of an idea: Maybe it would be interesting to make a film which was as much about those times as it is about John and Yoko.”

While active in left-wing politics, the couple had initially come to New York to find Yoko’s daughter who had been kidnapped by her father. But Yoko would not see Kyoko for 25 years.

“They sent out lots of private investigators and spent a lot of money and filed a lawsuit, but they never found her.”

Continually controversial, we hear Lennon’s many and various phone calls. His phone was tapped by the FBI. President Nixon launched an effort to deport him. And Ono was regularly mocked and falsely attacked by fans and the media as the reason the Beatles broke up.

“There is a narrative in the film,” Macdonald, 57, said. “You have three different strands. You’ve got the concert, the personal life and the political life and culture of America. Each one casts light on the other. I think that works very well for the film.

“We tell an overall story of John and Yoko and how they created this concert.”

Sean Ono Lennon, the couple’s son, Macdonald said, “was only involved with the production in that he had to give us permission to use everything.

“I pitched this crazy idea about how to make a different kind of music film to him and he really loved it and said, ‘Oh, that sounds like a film my mother would like.’

“Then he basically just said, ‘OK, whatever you want, whatever you need, just tell us.’ We were in touch with these archive people and that just opened the gates.

“Sean’s involvement was more to restoring the concert. The original concert had been poorly recorded and the songs would bleed one into the other.

“They used the latest sound equipment to clean up every track, and then they were able to remix it. That’s why when you see this in IMAX it is, honestly, the closest thing you’re ever going to get to see John Lennon live. At his peak. It’s amazing!”

“One to One: John & Yoko” is now screening at IMAX AMC Liberty Mall and plays Boston theaters April 18