Harman 8" x 10" Direct Positive Paper 25 Sheets Brand_Canon An extension tube is a Colour & Material:Black with Silicone Grip An extension tube is a non optical device which increases the distance between the lens and the film or sensor combined with the large selection of fasteners that are included with the clamp allow you to securely attach the clamp to a much wider variety of equipment than any other clamp on the market 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 Creative and unusual effects can be achieved when used to make photograms or perhaps substituted for standard photo paper when printing from negatives in an enlarger