An inspection assembly comprising: - a main body having a longitudinal axis and a distal end; - an ultra wide angle lens located at the distal end, said lens having an angle of view of greater than 180°; - a light source positioned rearward of the lens to illuminate an area to be viewed beyond the distal end of the main body; and - a metal collar including a reflection surface and a flange, the reflection surface being located at a distance along the longitudinal axis between the lens and the light source, an angle between the reflection surface and the longitudinal axis of the main body being between 10° and 70°, wherein the metal collar is a separate collar attached to the main body of the assembly, and the reflection surface is positioned such that, in use, a first fraction of the light emitted by the light source is reflected by the reflection surface before illuminating a periphery of the field of view of said lens and a second fraction of the light emitted by the light source travels to the field of view of said lens without being reflected by the reflection surface, and characterised in that the inspection assembly comprises a cap including an optically transparent dome-shaped window portion and an attachment portion, said window portion extending beyond a distal end face of the main body and extending over the lens and the attachment portion being engaged with the main body to secure the cap at the distal end of the main body and clamp the flange of the collar between an abutment surface of the main body and an end of the cap such that a part of the metal collar is located around the attachment portion of the cap and the flange extends over and covers the end of the cap to block light emitted by the light source that would otherwise be incident on the end of the cap. - a main body having a longitudinal axis and a distal end; - an ultra wide angle lens located at the distal end, said lens having an angle of view of greater than 180°; - a light source positioned rearward of the lens to illuminate an area to be viewed beyond the distal end of the main body; and - a metal collar including a reflection surface and a flange, the reflection surface being located at a distance along the longitudinal axis between the lens and the light source, an angle between the reflection surface and the longitudinal axis of the main body being between 10° and 70°, wherein the metal collar is a separate collar attached to the main body of the assembly, and the reflection surface is positioned such that, in use, a first fraction of the light emitted by the light source is reflected by the reflection surface before illuminating a periphery of the field of view of said lens and a second fraction of the light emitted by the light source travels to the field of view of said lens without being reflected by the reflection surface, and characterised in that the inspection assembly comprises a cap including an optically transparent dome-shaped window portion and an attachment portion, said window portion extending beyond a distal end face of the main body and extending over the lens and the attachment portion being engaged with the main body to secure the cap at the distal end of the main body and clamp the flange of the collar between an abutment surface of the main body and an end of the cap such that a part of the metal collar is located around the attachment portion of the cap and the flange extends over and covers the end of the cap to block light emitted by the light source that would otherwise be incident on the end of the cap. wherein the metal collar is a separate collar attached to the main body of the assembly, and the reflection surface is positioned such that, in use, a first fraction of the light emitted by the light source is reflected by the reflection surface before illuminating a periphery of the field of view of said lens and a second fraction of the light emitted by the light source travels to the field of view of said lens without being reflected by the reflection surface, and characterised in that the inspection assembly comprises a cap including an optically transparent dome-shaped window portion and an attachment portion, said window portion extending beyond a distal end face of the main body and extending over the lens and the attachment portion being engaged with the main body to secure the cap at the distal end of the main body and clamp the flange of the collar between an abutment surface of the main body and an end of the cap such that a part of the metal collar is located around the attachment portion of the cap and the flange extends over and covers the end of the cap to block light emitted by the light source that would otherwise be incident on the end of the cap.