International Holocaust Remembrance Day is marked every year on 27 January, commemorating the date of the liberation of the Auschwitz death camp in 1945. A powerful new exhibition at the Yad Vashem Holocaust Memorial in Jerusalem explores the power of photography during World War II.

The 1,500 photographs and 13 films on show come from various perspectives – victims and perpetrators alike. Photography, perhaps more than anything else, has come to shape our memory of the Holocaust. The "Flashes of Memory" exhibit also offers a glimpse behind the lens – showing the actual cameras used, the photographers who took the pictures and their various motivations.

The exhibition includes footage shot by Auschwitz's Soviet liberators and vivid photographs by British and American troops who freed other camps – depicting emaciated survivors, ash-filed crematoria, piles of corpses and the German civilians they forced to bury them so they couldn't plead ignorance later.

Besides serving as vital future evidence to try Nazi criminals, these were also aimed at re-educating the postwar German population and for domestic American consumption to legitimise the huge cost and sacrifice of joining the war.

Perhaps most insightful are the everyday photos taken by the Jewish victims themselves in various ghettoes, some in the service of the Nazis. "They used those images in order to present to the Germans their usefulness, their effectiveness," said Daniel Uziel, the exhibition's historical adviser.

"On the other hand, the Jews also seek, without permission, to document the crimes done by the Germans," continued Uziel, speaking of the photos that were taken stealthily, in a desperate attempt to document the atrocities against them to serve as future proof. For example, Zvi Kadushin, an underground photographer in the Kovno ghetto, did so at great personal risk and produced essential documentation as a result.

Several Holocaust survivors attended a preview of the exhibition. Staring at grainy video footage of Jewish children marching to their freedom though the barbed-wire fences of the Auschwitz death camp, 79-year-old Vera Kriegel Grossman pointed a finger at the screen upon identifying a dark-haired girl in a dirty striped uniform as her six-year-old self. "I can't believe that happened to me," she said. "I wasn't a child there. I was all grown up ... it was like I was 100 years old."

Flashes of Memory Photography Holocaust Yad Vashem
Israeli holocaust survivor Vera Kriegel Grossman points at herself in a film showing the liberation of the Nazi death camp Auschwitz by the Red Army in 1945 Gali Tibbon/AFP

Grossman says she considers 27 January her second birthday, since she was delivered from the horrors of the camp to freedom. "God opened the skies and sent us angels and rescued us," she recalled, upon seeing the Soviet troops who later filmed her and the number tattooed on her arm. "I am happy it was documented."

Grossman's father was gased and incinerated in the camp's crematorium, and she and her twin sister Olga were subjected to the ruthless experiments of the infamous Nazi doctor Josef Mengele. She said her resistance to him is what kept her alive. "I told myself what he would tell me to do I would do the opposite because he had no right to do these things to me," she said. "He took away my body because he could do that but he couldn't take away my mind."

Far less eager to discuss their experiences were identical twins Lia Huber and Judith Barnea, both 80. Seeing the images, and themselves in them, brought back memories both had spent decades suppressing. "It is buried inside our hearts and we don't talk about it," said Huber. "If you want to survive and continue life, you must continue and live with what you got and carry on."

Flashes of Memory Photography Holocaust Yad Vashem
Israeli twins Lia Huber and Judith Barnea, who survived the holocaust and the experiments of the Nazi doctor Josef Mengele in Auschwitz, stand in front of pictures showing the liberation of the Nazi death camp by the Red Army in 1945 Gali Tibbon/AFP

Controversially, the exhibition includes Nazi-produced material that were part of their vast propaganda machine aimed at both enhancing their powerful image – such as Leni Riefenstahl's famous films – and portraying the Jew as a decrepit, disease-infested yet sinister creature that was worthy of extermination.

Displaying Nazi propaganda in the museum posed a difficult dilemma for Yad Vashem. Vivian Uria, the exhibit's curator, said they tried to balance this with artefacts and testimony of survivors and victims who told their point of view. Ultimately, though, she said the visuals were essential and it was up to the viewer to look back at that dark era with a critical eye toward all those who documented it.

"The camera and its manipulative power have tremendous power and far-reaching influence," she said. "Although photography pretends to reflect reality as it is, it is in fact an interpretation of it."

Around 1.5 million people, most of them Jews, were murdered by the Nazis at Auschwitz-Birkenau in German-occupied Poland, between 1940 and 1945. In total, around six million Jews were killed by German Nazis and their collaborators during the Holocaust, wiping out a third of world's Jews.

Flashes of Memory - Photography during the Holocaust opens to the public at Yad Vashem in Jerusalem on 28 January 2018.