Harman 8" x 10" Direct Positive Paper 25 Sheets Brand_Canon An extension tube is a Color:Titanium An extension tube is a non optical device which increases the distance between the lens and the film or sensor 8G Special Edition will be your go to lens for great shots This paper can also be successfully used in other applications such as direct exposure in large format cameras or by cutting small sheets for exposure in LOMO type cameras Harman Direct Positive Paper is primarily suited for use in pinhole cameras where exposure and processing in conventional black and white photo chemistry achieves a unique positive print without the need for a film negative or inter negative