It is widely known that Christopher Nolan’s "Oppenheimer" was specifically intended to be viewed on the grand scale of a cinema screen. However, it is important to note that not all cinema screens deliver the intended immersive experience equally.

That’s part of the reason why Universal Pictures has made "Oppenheimer" tickets available early for over a thousand "premium large format" (PLF) screens, with options including IMAX 70 mm, 70 mm, IMAX digital, 35 mm, Dolby Cinema and more.

Knowing that even those words can get overwhelming and technical, Nolan went a step further: In an exclusive interview with The Associated Press (AP), he offered a guide to his favorite formats, explaining why it matters and even where he likes to sit so that audiences don’t feel like they need a film school degree (or one in theoretical physics) before settling on a theater.

"You rarely get the chance to really talk to moviegoers directly about why you love a particular format and why if they can find an IMAX screen to see the film on, that’s great," Nolan said. "We put a lot of effort into shooting the film in a way that we can get it out on these large format screens. It is a great way of giving people an experience they can’t possibly get in the home."

In a film about J. Robert Oppenheimer, the theoretical physicist who oversaw the development of the first atomic bomb during World War II, this will be especially pivotal in viewing the Trinity Test, the first nuclear weapon detonation. Nolan and his effects teams recreated the blast with all its blinding brilliance.

"We knew that this had to be the showstopper," Nolan said. "We’re able to do things with the picture now that before we were really only able to do with sound in terms of an oversize impact for the audience-an almost physical sense of response to the film."

"Oppenheimer," starring Cillian Murphy, opens in theaters on July 21.

Big picture

"Oppenheimer" was shot using some of the highest-resolution film cameras that exist. Like "Dunkirk" and "Tenet," "Oppenheimer" was filmed entirely on large format film stock, meaning a combination of IMAX 65 mm and Panavision 65 mm (think David Lean/" Lawrence of Arabia"), that’s then projected in 70 mm.

"The sharpness and the clarity and the depth of the image is unparalleled," Nolan said. "The headline, for me, is by shooting on IMAX 70 mm film, you’re really letting the screen disappear. You’re getting a feeling of 3D without the glasses. You’ve got a huge screen and you’re filling the peripheral vision of the audience. You’re immersing them in the world of the film."

Nolan has been shooting with IMAX cameras since "The Dark Knight." Audiences would regularly gasp at seeing its first shot projected in IMAX 70 mm. Though it’s "just a helicopter shot" of some buildings in Chicago, it helps explain the ineffable power of the format.

On a technical level, the IMAX film resolution is almost 10 times more than a 35 mm projector and each frame has some 18,000 pixels of resolution versus a home HD screen with 1,920 pixels.

Shot on 65 mm, projected in 75 mm

The 5 mm difference goes back to when that extra space on the film had to be reserved for the soundtrack. With digital sound, that’s unnecessary and it is "purely a visual enhancement," Nolan explained.

"We have to plan very carefully because by shooting an IMAX film, you capture a lot of information," he said. "Your movie will translate very well to all the formats because you’re getting the ultimate amount of visual information. But there are different shapes to the screen – what we call aspect ratios. So what you have to plan is how you then frame your imagery so that it can be presented in different theaters with equal success."

Starting with "The Dark Knight," they developed a system called "center punching the action" so that nothing is lost.

Cinematographer Hoyte van Hoytema is always aware of the "frame lines for the different theaters" when looking through the camera.

In the most effective presentation, IMAX 1.43:1 (the massive square screen), the screen essentially disappears for the audience. The top and bottom get cropped for other formats, like 35 mm.

But, Nolan said, "From a creative point of view, what we’ve found over the years is that there’s no compromise to composition."

Black, white sequences?

Some of "Oppenheimer" is presented in black and white for a particular story reason.

"I knew that I had two timelines that we were running in the film," Nolan said. "One is in color, and that’s Oppenheimer’s subjective experience. That’s the bulk of the film. Then the other is a black-and-white timeline. It’s a more objective view of his story from a different character’s point of view."

Nolan’s desire for the black and white portions to be of equal image quality to the rest of the film led to the development of the first-ever black and white IMAX film stock, which Kodak made and Fotokem developed.

"We shot a lot of our hair and makeup tests using black and white. And then we would go to the IMAX film projector at CityWalk and project it there," he said. "I’ve just never seen anything like it. To see such a massive black-and-white film image? It’s just a wonderful thing."

Nolan’s favorite theatrical formats

For Nolan, the "best possible experience" to view "Oppenheimer" in theaters is the IMAX 70 mm film presentations. These are also among the rarest, currently set for 25 locations in North America, including the AMC Universal CityWalk in Los Angeles, the AMC Lincoln Square in New York, the Cinemark Dallas, the Regal King of Prussia near Philadelphia, and the AutoNation IMAX in Fort Lauderdale.

The prints span over 11 miles of film stock, weigh some 600 pounds, and run through film projectors horizontally.

There will also be over 100 70 mm prints ("a fabulous presentation," Nolan said) sent to theaters around the world, with over 77 (and more to come) on sale in North America at major chains and many independent locations like the Music Box in Chicago and the AFI Silver in Washington D.C.

"The two formats are sort of different, and I love them both," he said.

The sequences projected in IMAX 70 mm really "come to life" on those screens, and vice versa for the 70 mm sequences on those specific projectors. In IMAX theaters, for example, things shot with IMAX film cameras will expand vertically to fill the entire screen.

Imax digital, laser options

Most moviegoers in North America will have easier access to digital presentations. These include IMAX digital, which can sometimes mean a laser projected image and other times involves a retro formatted screen, and what’s called "exhibitor PLF," meaning large format screen and projection systems developed by individual theater chains (like Regal RPX, Cinemark XD and Cineplex UltraAVX). When in doubt, look for an "X" in the name.

But don’t dismay: It’ll still look great, according to Nolan, whose team has worked for six months to digitize the original film for other formats to ensure the best experience on every screen.

"This is the exciting thing about shooting an IMAX film: When you scan it for the digital format, you’re working with the absolute best possible image that you could acquire, and that translates wonderfully to the new projector formats like the laser projectors," he said.

Nolan said the "IMAX impact" over the last 20 to 30 years has resulted in more theaters paying more attention to presentation, from projection to sound, which has been "great for filmmakers."

Where are the best seats?

That comes down to personal preference, but here’s where Nolan likes to sit.

"When I’m in a theater that’s Cinemascope ratio, I like to be right near the front, middle of the third row," he said. "When I’m in a stadium, IMAX 1.43:1, then I actually like to be a little behind the center line, right up at the middle. So, a little further back."