Nokia has apologised after it emerged that an advert featuring video footage which appeared to have been filmed with its new flagship smartphone the Lumia 920 had in fact been created using different equipment.

The Verge news tech site revealed the issue after it noticed a window reflection revealed a cameraman holding what appeared to be an SLR camera.

In a blog post the handset maker said it should have "posted a disclaimer".

The news threatens to take the shine off the launch of the Lumia 920 phone.

This BBC video shows the first 30 seconds of the advert with the reflection visible at the end repeated once again in slow motion.