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: Leica C-Lux 3 Digital Camera (White)
Product description: Compact Camera
Product feature: Leica quality, Sharp Leica Lens, Easy operation, Extremely compact size, Large brilliant veiwing screen
Product brand: Leica
Target attributes: Camera Weight
Answer: attribute: camera weight
value: None
source: None