Instruction: Parse the product information to locate the target attribute, and then provide the extracted value of the target attribute and its source in the output, specifying None if the attribute is not present.

Input:
Product title: ND8 (Neutral Density) Multicoated Glass Filter (62mm) For Leica V-LUX (Typ 114)
Product description: Neutral density filters reduce or modify the intensity of light wavelengths. This allows the photographer to choose certain combinations of aperture, exposure time and sensor sensitivity that would otherwise produce overexposed pictures Neutral Density Filters Have Four Main Uses: To enable slow shutter speeds, especially with high speed films, to record movement in subjects such as waterfalls, clouds or vehicles. To decrease depth of field by allowing wider apertures to be used, which helps separate subjects from their background. To decrease the effective ISO of high speed film (above ISO 400) and allow it to be used outdoors in bright situations. To allow cine and video cameras (which have fixed shutter speeds) to film subjects such as snow, sand or bright scenes.
Product feature: TYPE: Solid ND | RESISTANCE: Scratch, Water, Oil | DENSITY: 0.9 (3 Stops) | CONSTRUCTION: Schott Glass | THICKNESS: 0.25" (~ 6mm) | FOILS: Steinmetz High Efficiency | COATING: X Optical Nano (2 Layer) | TRANSMISSION (LIGHT): 99.2%, HIGH QUALITY GLASS: Multi Green Coated - Double Layer Polish, Slim Design Minimizes Vignetting, Water Repelling, Oil Repelling, Scratch Resistant, 10 Year Warranty
Product price: $24.38
Product brand: Digital Nc
Target attributes: Size
Answer: attribute: size
value: 62mm
source: product title