Instruction: First, identify the target attributes from the provided list. Then, scan the product title, description, feature, and brand to extract the values associated with each target attribute. Finally, create a list of dictionaries, each containing the extracted attribute, its corresponding value, and the source where it was found.

Input:
Product title: Canon EOS-M Mirrorless Digital Camera with EF-M 22mm f/2 STM Lens Silver
Product description: Capture images that are packed with clarity and color and can be printed at sizes up to A2 in amazing detail. An APS-C sized 18-megapixel sensor is of the same dimensions as those used in EOS DSLRs, and offers the same superb image quality. EOS M, the camera's Scene Intelligent Auto technology analyzes the subject. Create beautiful images, using smooth out-of-focus backgrounds for a professional look with impact.
Product feature: 18.0 Megapixel CMOS (APS-C) sensor, DIGIC 5 Image Processor, ISO 100-12800; expandable to 25600 (H), Hybrid CMOS AF and Multi Shot Noise Reduction, EOS Full HD Movie mode with Movie Servo AF for continuous focus tracking of moving subjects, Compatible with Canon EF and EF-S lenses (Optional EF Lens Adapter is required), Compatibility with SD/SDHC/SDXC memory cards, including new Ultra High Speed (UHS-I) cards
Product price: $45.78
Product brand: Canon
Target attributes: Optical Zoom
Answer: attribute: optical zoom
value: None
source: None